A puzzle game where players discover electronics in a tangible way, using the first physical representation of electronic circuits.
Latest Updates from Our Project:
Spintronics Progress Update #16: New Issues (and how to fix them) and Shipping Updates
over 1 year ago
– Sat, Dec 03, 2022 at 03:35:28 AM
Friends,
It's great to see that Spintronics has made its way into most people's hands now! It looks like the only location that's going to be cutting it close is Canada, but everyone else (except New Zealand and some other parts of the world) should either already have their games or will get their games soon (before Dec 25th). I'll get to that later in the update.
Virtual Pack
First, I wanted to mention that those of you who get the Virtual Pack as part of your reward should have received an email a little while ago with a link to the download. I put a lot of information into the Virtual Pack. Anyone wanting to make their own parts should have everything they need.
New issues
It's been helpful to see the problems people are having with their games out in the wild. Generally, it seems like it's holding up quite well! We received samples of the games about a week ago and everything worked as it should. I remember having significantly more problems with Turing Tumble in our first batch. Nevertheless, we do see some common patterns of problems. I thought it might be helpful to collect what we've seen so far here so that if you have the same problem, you'll know what to do.
Problem #1: Battery knob
The most common problem has also been the most unexpected. We've seen about 15 instances of the battery knob breaking.
The most common problem we've seen so far. Sometimes the little half circle on the inside of the knob breaks off. That's what holds the string, so sometimes if the knot isn't big enough, it will shoot right through the knob and into the battery.
This is a new problem that we never saw before. The string pulls hard on the knob cap and sometimes it breaks the cap like in the picture, releasing the string. About 50% of the time when this happens, the knot on the end of the string is big enough that it stays inside the knob - it can't pull through the little hole in the end of the knob. In that case, the battery still works fine, it's just missing the little cap on the back of the knob (though that can be glued on again to make it look as it should).
The other 50% of the time, the knot doesn't stop inside the knob. Instead, the knot pulls through the knob and the string gets pulled all the way inside of the battery. When that happens, it's trickier to fix. We can send you a new battery if that happens, but if you're comfortable, you can fix it yourself.
Here's how to fix it (if you're comfortable with it):
Start by going through these instructions for taking the battery apart, up to step 5. Then skip to reassembly at step 8. At step 10, you will feed the string back through the two grommets and the nut, and then through the hole in the knob. Make a new knot big enough that the string can't pull back through the knob. Then complete the rest of the reassembly steps. Keep in mind that this is going to be tricky unless you are comfortable with mechanisms. If you have too much trouble, contact us at [email protected] and we'll be happy to send a new battery to you.
If you want to be extra careful and prevent this problem from evenhaving a possibility to occur, we recommend taking the little cap off the back of the knob of your good battery and adding a few more knots to the end of the string. That way, even if the cap breaks, there will be no chance that the string gets sucked inside the battery.
Problem #2: Battery clicker
We've only seen a few instances of this, but sometimes the little ratchet mechanism inside the battery breaks like this:
Once in a while, the little clicker arms break off inside the battery. This is pretty rare. When this happens, you can charge the battery, but it won't push on the sprockets, it will just discharge internally.
There's no quick fix for this. If this happens, you'll need a new battery. Contact us at [email protected] and we'll send you a new one.
Problem #3: Resistors spinning too fast
I'm not 100% sure why this happens yet, but some resistors act as though they don't have enough silicone oil in them. When you hook them directly up to the battery, they start spinning slowly, as they should, but then they accelerate, accelerate, accelerate until they're hardly resisting at all. Seems to me it's probably because the silicone oil is getting pushed to the edges and, since there's not enough silicone oil, the axle inside becomes surrounded by air rather than silicone oil. That's when it spins fast. Here's a video someone sent us of a 200 ohm resistor doing just that:
There's no fix for this one. If the problem is minor, you can just let the resistor sit for a moment and the silicone oil will quickly flow back where it should be. If the problem is more serious, like the one in the video, then you'll need a new resistor. Contact us at [email protected] and we'll send you a new resistor.
Shipping update
Here's a quick shipping update for you all:
United States
Almost all orders have gone out. Some of you didn't fill out your survey or your credit card didn't work, so you may want to check that before contacting us if you still haven't received a shipping confirmation.
United Kingdom
Most orders have been shipped out, but about 600 still haven't shipped. This should happen early next week.
European Union
All the games arrive at the warehouse on Dec 6th (Tuesday). We expect they'll be able to turn around and get them shipped out pretty quickly.
Australia
All orders have gone out. There were a significant number of orders that got mixed up, so we're still sorting through customers who got too much, too little, or the wrong thing.
Canada
It's a nail-biter. On December 8th, the containers will arrive by rail to Toronto where our warehouse is located. We're hoping they'll be able to get the containers out of the railyard and to the warehouse quickly, and that the games will get shipped out fast from there.
New Zealand
Our shipment from Australia to New Zealand arrives at the New Zealand port Dec. 19th. Shipments will probably start going out soon after, but most won't make it by Christmas.
Everywhere else
We're going to start shipping to the other locations next week. These shipments will come from China and they vary greatly in terms of how long they will take to arrive.
Phew! This is a wild ride with Kickstarter fulfillment and Christmas happening at the same time. I think we'll try to not ever, ever, ever do that again. :)
Thanks again, everyone! It fun to see it in your hands and hear your thoughts on it.
Paul and the Team at Upper Story
Spintronics Progress Update #15: Shipping Progress
over 1 year ago
– Sat, Nov 05, 2022 at 06:08:58 PM
Friends,
We're getting so close! Below is an update on each shipping location, starting off with some good news from Australia.
Shipping Update
Australia
Last night, the Australian container was delivered AND checked in. Our warehousing partner in Melbourne has been taping shipping cartons together in preparation for the Kickstarter delivery. His exact words were “We’ll aim to get them all out next week."
US
One container has arrived and the inventory has been checked into a warehouse in Nevada. Two containers are at the Port of Chicago waiting to be “pulled.” Since we already have stock in the Nevada warehouse, it would be great if we could at least send out orders on the west coast, but our warehouse does not have a management system that can accommodate that, so we must wait until stock is available at both Nevada and Chicago.
We don't expect it to take much longer to pull our containers and move them to the warehouse (which is only a short distance away), but right now we're at the mercy of the railyard, and they give zero information. All we can do is wait and repeatedly ask, "Did it move yet?" And so far, all they say is, "Nope, it's still stacked."
This video shows one of the Chicago railyards from a drone's perspective. At 1:05, you can see a reach stacker lifting a container onto a semi truck chassis. This is what we're waiting for right now. Once that happens, our shipping company will be alerted and then they will send a truck to pick it up. There were labor strikes in September that caused the port to get behind. But really, it seems like the Chicago port is just sort of always behind.
UK
November 14 is the appointment for delivery at the warehouse! Our warehouse is in Blackwood, UK.
Canada
November 19 is the ETA to Vancouver. Then it will get on a rail to Toronto. From the Port of Toronto, it will be picked up by a truck and brought to our warehouse in Oakville, Ontario.
EU
November 22 is the ETA to Rotterdam. From the Rotterdam port, it will get picked up by a truck and brought to our warehouse in Nieuwegein, Netherlands.
Steve Mould
A few weeks ago, I flew to London with a complete set of Spintronics games in the carry-on luggage and a set of resistors in a Tupperware container at my feet.
Back during the Kickstarter, Steve Mould, a well-known YouTuber who makes cool science videos, sent me an email with the subject line, "Spintronics is the coolest flippin' thing I've ever seen!" He said he wanted to do a video with Spintronics in it and he had an idea for something specific he wanted to show. We decided to wait until Spintronics was just about to be delivered. So when the time came, I sent him an email and offered to fly out there to show it to him. He took me up on it.
His studio was in an old warehouse right off the Thames River that was converted into workspaces used by artists, makers, and designers.
One of the buildings converted into artist studios. Steve records his videos in one of them.
In front of the studios was this old, decaying boat called "The Royal Iris". Despite its appearance, it has a rich history. A lot of famous bands played on it, including the Beatles, who referenced it in their song, "That Was Me". The Queen even rode on it. In 1991, it was taken out of service and a variety of people bought and sold it, hoping to turn it into a nightclub boat. It never really happened, though, and here, in 2022, it sits and decays.
He led me through the long hallway, past studio after studio, each with nothing but the name of the artist on the door. It was obvious when we arrived at Steve's studio - besides his name, the door was covered in "Danger" and "Hazardous Chemical" signs.
It was surreal to see Steve in his studio where he records his videos. We spent about 3 hours talking. He's nice. I really liked him. I explained how Spintronics works and showed him a variety of interesting circuits with it. I was impressed with how fast he picked up on everything! He had questions, told me some things he wanted to demonstrate, and he took me out for lunch. I flew back home the next day.
Steve and me in his studio. He said he used to record his videos from his house, but it took a long time to set up and take down the camera equipment, and his wife wasn't a fan of leaving it set up all the time. He also has three young kids that make it extra challenging to record from home.
In something like 9 days, he managed not only to learn Spintronics well enough to teach it, but also to pull together content for a video, record it, and edit it. Eight days ago, he posted the video. We didn't even know he posted it until someone posted a comment here.
I was nervous the first time I saw it, but was relieved to see that he did an *excellent* job! I was really impressed.
Here's the video he made:
James Turing
While in the UK, I also traveled to Edinburgh to finally meet James Turing in person. James Turing is the great nephew of Alan Turing, and about 10 years ago, he started a charity called the Turing Trust. He does this full time, and he runs an extremely efficient operation staffed in large part by volunteers. He and his team refurbish used computers, load them with an operating system and software, ship them to communities in need, and train teachers there on how to teach with them.
So far, their main focus has been on bringing computers to Malawi. When they started, only 3% of students had access to computers. Now, they're almost solely responsible for bringing that up to something like 70% (I can't remember the exact number).
While there, I got to see their warehouse where they collect computer donations, process them, and ship them out. It was really impressive! I kept thinking, even if I could somehow get a hold of that many computers, I wouldn't have the foggiest idea how to place all of them somewhere where they would be useful.
James and me, in a part of the Turing Trust warehouse. Most of the computers here have already been processed, and they're getting ready to put them on a shipping container to send off.
Well, everyone, it's not long now! We will post in the comments section when we have new shipping updates.
Thanks again for your patience, everyone!
Paul and the Team at Upper Story
Spintronics Progress Update #14: Ships on the Water and Locking Orders
over 1 year ago
– Wed, Oct 12, 2022 at 02:32:55 AM
Friends,
It's happening! All the completed Spintronics kits are on boats, traveling towards their destinations in the US, UK, Netherlands, Australia, and Canada. This means it's time to lock orders and charge credit cards for shipping, taxes, and any additional items you ordered on BackerKit after the Kickstarter. You may remember that Kickstarter already charged you for the items themselves, but shipping and taxes were determined after the Kickstarter on BackerKit. Some of you have already had your cards charged for those things, but for most of you, we will charge credit cards on Thursday, October 13. If you need to modify your order or update your credit card before then, you can do it here: https://spintronics.backerkit.com/
Estimated Ship Arrival Dates
United States
The boat actually arrives at the Los Angeles port today! That was quick. It will then travel by rail to the warehouses. There, the containers will get unloaded and moved into the warehouses, after which warehouse workers will begin fulfilling orders. We expect it will be another 2-3 weeks before you get a notification that your package has shipped.
United Kingdom
The Al Dahna Express is estimated to arrive at the Southampton port on November 4.
The Al Dahna Express was built only 6 years ago and sails under the flag of Liberia. It's a pretty big container ship with a capacity of 18,800 TEU. (The average capacity of a container ship nowadays is roughly 16,000 TEU.)
It will probably be another 2-3 weeks after that before you get a notification that your package has shipped.
Canada
The MSC Lisa is estimated to arrive at the Toronto port on November 29.
The MSC Lisa was built in 2004 and sails under the flag of Panama. It's a small container ship, with a capacity of only 5059 TEU (that's "Twenty-foot Equivalent Units). The average capacity of a container ships nowadays is more like 16,000 TEU.
Two to three weeks after that you should get your notification that your package has shipped. (Hopefully closer to two weeks!)
European Union and Australia
We're still waiting to hear from the freight forwarder on the status of these two shipments. We'll put a comment on this update when we hear the ETA for each of the ships.
We tried to take care of every issue we ran across, but you may discover some new problems that we didn't find ourselves. Please tell us if you do! As of now, we're aware of only three issues in the production copies:
1. When under partial vacuum and not upright, the resistors leak silicone oil. This shouldn't be a problem unless you ship Spintronics upside down or sideways by air. Note that I wasn't quite right in my last progress update. Cargo planes almost always ARE pressurized to the same degree as commercial passenger planes - to roughly 75% of the atmospheric pressure on the ground. In fact, the same airframes are used for cargo and passenger planes. Here you can see the front and the back of the big pressure vessels that aircraft are built around.
Here's the back of the pressure chamber in an aircraft before it's sealed in place. (Picture from https://www.quora.com/Do-they-pressurise-cargo-planes-if-they-have-non-living-cargo)
The front part of the pressure chamber in an aircraft. The nose cone isn't on in this picture. (Picture from: https://www.quora.com/Do-they-pressurise-cargo-planes-if-they-have-non-living-cargo)
I haven't tested it yet, but the resistors probably also leak when the pressure is only reduced to 75% pressure. All that to say: spintronic resistors may leak on a passenger plane if they aren't kept upright. If you need to transport Spintronics and you can't bring it with you in carry-on luggage to keep upright, I'd suggest shipping it to yourself by ground transportation.
2. The battery is a little bit overpowered. It's supposed to be a 6 spin volt battery, but some batteries are more like 6.5 or even 7 spin volts. In this video, you can see the voltage the battery is producing as it discharges into the resistor:
This is actually pretty realistic, as new electronic batteries often produce a voltage that's roughly 10% higher than their rated voltage. (For example, a new AA battery doesn't produce 1.5 V, but rather more like 1.6 to 1.65 V.) However, for us, that's not a particularly desirable thing because it can make some puzzles a little confusing. If a voltage divider is supposed to produce 3 V and instead it produces 3.5 V, you might think something is wrong.
3. Some of the batteries have two malformed indentations in them. The little indentations help line up the base tiles when you connect them to the batteries. In these affected batteries, the indentations aren't quite big enough, so the base tiles don't fit into them as well. They still work, but you have to push a bit harder when you're connecting a base tile.
Two batteries, one of which has two malformed indentations (Battery B). It's hard to see in this picture, but you can see it better in the next one.
Closer up you can see that the injection mold cavity that made Battery B wasn't cut away completely. It appears that just one of the many cavities has this problem.
We didn't notice this problem until production because it's only in one of the injection mold cavities. Fortunately, it's not a big problem. I don't think it will even be noticeable to most people.
We're all very excited for you to get your kits. Today I looked back on an old email from March where I wrote, "the molds are complete and everything else is 99% of the way there". Ha ha! That last 1% was a real doozy! I can't tell you how much we appreciate your patience and support. This won't be the last update, but, being that we're 99.9% of the way there now, it sure is close. Thanks again, everyone!
Paul and the Team at Upper Story
Spintronics Progress Update #13: A Little Scare, but Production Is Now Complete!
over 1 year ago
– Wed, Sep 07, 2022 at 06:48:06 AM
Friends,
I'm very happy to say that production is complete! Very. Happy. We had some unexpected, kinda scary problems to solve this last month, but the engineers at LongPack and I managed to sort them all out. At this point, we're just waiting on the shipping containers to be loaded onto boats, which ought to happen any day now.
The Resistors Were Difficult
You may remember in the last update, it ended with one remaining problem to solve: the resistor values weren't very accurate. Some were high, some were low. They weren't within the +/- 20% we were shooting for at all. Why weren't they more accurate? Was there uncontrolled friction in the system? Was the silicone oil not mixed well enough? Was the amount of silicone oil in each resistor different?
Well, after getting comments from you guys on the last update, the next experiment became pretty obvious. I simply weighed the resistors and compared their weight to their resistance. I found a strong correlation: The more a resistor weighed, the higher its resistance was.
The heavier the resistor, the higher the resistance. The cause of the imprecise resistances was the imprecise addition of silicone oil.
That suggested that the cause of the imprecise resistances was the imprecise addition of silicone oil. Some resistors had a little more silicone oil and some had a little less. I sent these results to LongPack and they adjusted their automatic dosing machine to make it more precise. They sent this video of the setup they used to test the silicone oil dosing machine. You can see at the beginning of the video they have a balance on the table that they used to check weights and make sure they were all very close to the same.
LongPack sent resistance values of the new resistors and they did indeed managed to get the resistor values accurate to well within +/- 20%. Yay! Problem solved.
The Resistors Were More Difficult
Ok, so I've tested the resistors many times for leaks. I've placed them in ovens, I've had them sitting around sideways and upside down for long, long periods of time, and we've used them repeatedly, all without any leaks whatsoever. However, any time I got resistors in the mail that LongPack assembled themselves, there were always a lot of leaks.
At first, I thought the problem was caused by their use of shielded bearings instead of sealed bearings. LongPack eventually started using sealed bearings, but they warned me that they were still seeing leaks in their resistors when they were left upside down. They took a close look at the resistors and concluded that oil was leaking in a space between the axle and the bearing. They proposed modifying the injection mold to add a little plastic to the diameter of the axle, giving it a snug fit in the bearing that oil couldn't leak through.
This was never a problem when I assembled resistors, but LongPack needed to assemble them a different way to make the process more efficient. It could be that their method didn't make quite as good of a seal and required this new modification.
To stop the leaks, LongPack proposed to make the axle diameter slightly larger to give it a tight fit in the bearing.
The trouble with modifying the parts is that it could mean a LONG wait. In the past, modifying injection molds has been a month-long process. After that they'd still have to chip up the old parts and mold new ones, which could add another couple of weeks.
LongPack did it in light speed. They modified the mold and had the modified parts all molded within a couple of weeks. They tested the resistors made with the new, thicker axles, and found...no leaks! Yay! Problem solved.
The Resistors Were Even More Difficult
I said, "OK, great. I trust that you've solved the leak problem. Go ahead and finish production of the games, resistors and all." So they did. They assembled all of the resistors and they packed up the final Spintronics kits!
LongPack put together the final kits! Here are a few of the palettes.
Then LongPack sent me the final production samples of the resistors. I opened the box, excited to see the new, leak-free resistors! But what I found was, once again, a bunch of resistors that leaked. Uh oh. These leaky resistors were in every single fully-assembled kit.
What on Earth?!? How could they have leaked again?
I examined the resistors and it was clear that they were leaking out the top, right through the sealed bearings. It was a hot day when the package arrived at my doorstep. Maybe the heat expanded the silicone oil and the air inside the resistors, forcing silicone oil out through the bearing?
So I put one of my leak-free resistors and one of their resistors upside down in a 96 °F oven for hours, fully expecting LongPack's resistor to eventually leak again.
Testing two resistors for leaks, upside down in an oven at 96 °F. Neither one leaked at all.
But neither one leaked. It could be that it got hotter than 96 °F during shipping, but I doubt it. So what else could have caused it to leak?
That's when I started reading about cargo planes. Now this might be obvious to some of you, but I didn't realize that in cargo planes they don't pressurize the cargo hold like they do in passenger planes. In a cargo plane flying at 30,000 feet, the air pressure is only about 30% of that at sea level.
Commercial planes (both cargo and passenger) typically fly at an altitude of somewhere between 33,000 and 42,000 ft. At those altitudes, the pressure is 20-30% of that at sea level.
That's a massive change in pressure! Could the relative vacuum outside the resistor suck the silicone oil out? I quickly cobbled together a vacuum system and put two more resistors inside - one that I assembled and one that LongPack assembled.
I dropped the pressure in the desiccator to about 30% of atmospheric pressure for 10 minutes and then checked for leaks.
Then I dropped the pressure down to roughly 30% of atmospheric pressure. Sure enough, only 10 min after dropping the pressure, both resistors leaked! I've never been so happy to see leaky resistors!
The Resistors Are OK!
I breathed a big sigh of relief. The leaks were simply caused by low pressure in the cargo hold during air shipping. This should never, ever be a problem with a kit sitting on your shelf, even if it's upside down for years.
It's also not a problem for most transportation: Passenger planes are always pressurized, even the cargo holds, so you can feel free to pack resistors in your luggage. In fact, I've already done that. The only thing I don't recommend is to ship a game to your friendby air. Ship it by ground transportation. If you must ship by air, be sure it is packed flat, with the resistors oriented right side up.
We took a couple of extra precautions to make sure the big freight shipments are transported safely. First, we changed the cartons so the games all pack flat, with the resistors right side up. Second, we put the resistors that are at greatest risk of leaking (the low value resistors) in little plastic bags so that if they do leak, they won't ruin the puzzle books. And finally, they'll be shipping by ocean and ground transportation, so we shouldn't even have the problem to begin with. If your resistors do end up leaking during ground shipping (like if you live on Mt. Everest), we'll be happy to replace them for you.
In the future, we'll redesign the resistors so they seal well enough to go into space. Until then, don't try to build any spintronics-based avionics.
We're finally on to the next phase: freight shipping. We don't expect any significant delays.
Thanks again, everyone! It won't be long now!
Paul and the Team at Upper Story
Spintronics Progress Update #12: Production Is Almost Complete! Also, We're Hiring!
over 1 year ago
– Wed, Aug 10, 2022 at 11:45:38 PM
Friends,
We are right up to the finish line! LongPack has made excellent progress. All of the parts are assembled (except one, which I'll elaborate on below), and we are just days away from everything being complete. Woohoo!
LongPack sent some pictures and videos that I think are pretty amazing. The scale is hard to comprehend. Let's start with a video. Here's someone at a station where they are doing the final steps of putting together spintronic junctions:
That took a minute, right? And keep in mind that several of the parts were already pre-assembled before getting to this point.
Now, here are a lot of junctions:
A whole lot of junctions. This is only about one tenth of the junctions they are making.
I did the math and it looks like that's only about one tenth of the total number of junctions they're making. So imagine 10x that amount. You could literally swim in junctions (it kind of looks like the guy in the back corner is already doing that).
And that's only one spintronic component. The battery is the most complicated part with the most pieces. Here is a video of an employee putting together spintronic batteries:
And here are some of the batteries that are (mostly) finished:
A whole bunch of assembled spintronic batteries waiting to go into kits.
Here's an insane number of switches. This might be all of them:
A buzillion spintronic switches at an awkward angle.
The other parts are ready to go, too! What's left is to put them into the final kits and then seal the boxes.
Resistor Accuracy
The only part that's notquite ready to go is the resistor. LongPack sent about 10 resistors of each value (1000 ohm, 500 ohm 200 ohm, 100 ohm, and 50 ohm) for me to test because they were having trouble getting consistent resistance values. I tested them and found that they truly were less accurate than I expected.
To give a frame of reference, when I make resistors myself, I'm able to get them accurate to within +/- 10%. I asked LongPack to make them accurate to at least +/- 20%. I thought it would be easy for them, but something must not be quite under their control because they don't meet that level of accuracy. For instance, here are the resistances I measured for ten 500 ohm resistors:
Resistor #1: 488 ohms (2% error)
Resistor #2: 605 ohms (21% error)
Resistor #3: 606 ohms (21% error)
Resistor #4: 608 ohms (22% error)
Resistor #5: 529 ohms (6% error)
Resistor #6: 648 ohms (30% error)
Resistor #7: 599 ohms (20% error)
Resistor #8: 648 ohms (30% error)
Resistor #9: 543 ohms (9% error)
Resistor #10: 627 ohms (25% error)
Honestly, the vast majority of people probably wouldn't even notice this level of error in their resistors, but I'm bothered that there's something causing error that's not under our control.
At first, I thought it must be the amount of silicone oil they added to the resistors. Maybe some employees add more or less silicone oil than others? But then they sent this video showing how they fill them:
That ought to be way more accurate, or at least more repeatable than how I was doing it with my little syringe. Clearly there's friction coming from some other source than the silicone oil. We had a video call last night with LongPack's lead engineer on the project to see if we could figure out the source. We had some ideas and today he flew out to the factory where they make them to see if he could get the problem fixed for good. I don't think this will take more than a few days to solve. And, worst case, the resistance values they're getting aren't terrible. If we need to widen the tolerance window to +/- 30%, we could. But I think we can fix this and probably even get it down below +/- 10%.
LongPack's plan was to be completely done with assembly by next Monday (the 15th), but this little resistor problem will probably push that back a week. Regardless, production is very close to complete! In the end, I suppose it's poetic that it's the resistors, of all parts, that are slowing us down. That's just what they do.
Hiring
And finally, we're hiring! We're planning to hire three people in all: two engineers to help us develop new products and another person to help with analytics, advertising, and marketing. You can find the job descriptions here:
If you or someone you know is interested, please send your resume to Alyssa Boswell ([email protected]).
Thanks again for your support and I can't wait to get Spintronics out to you all. I can't wait to see what you think of it and I can't wait to see what sorts of circuits you build.
