Superplexus is a 3D maze toy that involves you turning a plastic ball around and around on all axes trying to get a ball bearing from 1-100. Although it was a flop for manufacturer Tiger Electronics when released in 2002, it's an excellent pastime for "grown-ups" who are waiting on a render, or want to concentrate on something away from the dreaded computer. I will do a video to put on this post as soon as I can figure out the best way to do it - I'm currently thinking of strapping the camera to my head - because with the ball bearing not being very big, it can be difficult to see in the crowded interior of the ball. All I can say with certitude is that this is something that everyone ought to have a go at.
I've had a look on eBay in the US, UK, France and Germany and there are all examples available there for less than 30 (£|$|€), so go to it!
To learn more about Michael McGinnis, the inventor, or Superplexus itself, go to: http://www.santarosa.edu/~mmcginni/myart/invention/superplexus/