[fnord]

I can never get those things to work, nor those hidden pictures in the funny pages.

[petuniasevan]

Here's how I taught poorman to "read" 3d stereograms:

I painted two white dots on a windowpane, then had him stand close to the window and look through it at the trees outside. I had him move forward and back until the white dots seemed to merge into a third, center dot.

That's the secret. You have to look THROUGH this image, as if you were focusing on a more distant object.