By that i mean those look carefully and a 3d shape emerges. HMm, thats kinda abstract.

I'll try to explain more fully. You know those pictures that look like random colours put together. You put the paper to your nose, and start to move the paper back SLOWLY, and if you do it right, a 3d shape emerges. Thats the best i can explain it. Can someone who knows what im talking about tell the exact name for this?

Anyway, make a wallpaper that uses this technique. Is it possible?