I personally really appreciate this technical insight. I was inspired a lot by that physics whiteboard system too, and have always wondered what happened to it.

I find it interesting that you've done a video in a very traditional ACM report style, as if it was made for a Siggraph presentation. I find that funny because the earliest computer graphics software, called Sketchbook, had a lot to do with drawing as a computer-human interaction. A lot of those ideals were lost for years, and I think people are delighted to play your game because it unknowingly unearthed them.