If you've done those "magic picture" things, perhaps you'd like to try my first experiment in 3D photography. Basically, get close to the screen, look crosseyed at these photos until you see a 3rd photo in the middle. Wait for it.... wait for it.... get it in focus.
Awesome. If successful, you'll see a 3D image of the cluttered surface of my desk, and a magnet with some paperclips, and some seed packets. Not super interesting subjects, but kinda nifty to do. I'll see if I can't find a better subject to try it on.
Post a comment if you get it to work. If you want to try some others, check out these and these. Both the sites require you use the same "crossing eyes" technique.