As a CS person, ingenious mechanical solutions to problems like this always amaze me. If I had to solve this problem I'd probably end up with a bunch of accelerometers and gyroscopes wired up to a complicated program trying to do rotation correction. Mine would be slow, heavy, and probably not work. And then some genius would tell me about Rollerons.<p>Makes me wonder how many of the problems we solve with code could be done in other ways.