Ah, thanks. I considered doing a lights on/off button like project euler, but decided not to. Part of it was that it seemed like additional complexity and I was

Ah, thanks. I considered doing a lights on/off button like project euler, but decided not to. Part of it was that it seemed like additional complexity and I was worried it might overload the minimalist design, and part of it was that I'm not a javascript developer, so additional overhead is more of an issue than it would be, say, for a n intern at the Khan Academy ;) Ultimately, it would be great for someone to do that, but this is more proof of concept than a product per se.