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Really enjoy the different take on the interface.. feel like you might be missing something in having modality though, seems like you could combine the actions for drawing a gear and drawing a belt, which would make it a bit neater.

Any plans to add more complicated gear types? Would love to see something like this enabling easy explanations of watches and the like..

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In case you're interested, here are two of the best video's I've seen describing how a watch works ( http://www.youtube.com/watch?v=OiCPu0SjEW4 ) and how a differential works ( http://www.youtube.com/watch?v=K4JhruinbWc&t=1m50s )

Don't let their old school-ness throw you off. They are both extremely well done and demonstrate in clear and simple language from first principles to finished object.

Hah, the first thing I did was build a going train. I had to use belts for the second, third, and fourth wheels because the planarity was difficult or impossible to manage.

It was of course more like an electronmechanical clock since there isn't a way to build a balancewheel and escapement, but since I had to eyeball the gear sizes and draw them with my mouse anyway, it now appears to be approximately 0:65:101am.

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