Here's more work on faking three dimensions on a flat plane.

Disco 3D: Behold the three dimensions!

Again, this only works from the perspective of the ball, so one person needs to hold it fairly near their point of view to get the effect. And, from the brief demo we did at the workshop, sometimes people need a few minutes to adjust to the effect before they feel like they're navigating space.

At this point, it seems like more of a fun demo or a parlor trick. One really good suggestion we got recently, though, was that we could give participants a button, say on a Wiimore, that would allow them to assume the first person perspective if more than one person is navigating the space. That might help share the experience a bit better.