Boards
austereograms
http://en.wikipedia.org/wiki/Autostereogram
can you see them? if so, how?
i just cross my eyes and stare at the centre until the image pops out. another technique i hear is bring your face close (6 or so inches) to the screen and stare blankly at the centre for a few seconds.
used to have a magic eye book around the house for most of my life, but i only started to be able to see them from about the age of 13 or so. couldn't see anything at all before and it was so frustrating
WHAT DO YOU SEE
•http://acidcow.com/content/img/new02/377/34.jpg