[bfrs]

If you are having trouble with this, wikipedia has some good instructions which helped me. First try autostereograms [1] (these are more simpler to see), and then simple random dot stereograms (RDS) [2], and finally magic eye static and moving stereograms.

BTW, the book which introduced RDS: "Foundations of Cyclopean Perception" by Bela Julesz is considered one of the most influential books in cognitive science. With just a computer, using no invasive microelectrodes and animal sacrifices, he proved a fantastic result...stereopsis (fusion of the individual images from each eye) occurs before object recognition!

[1] http://en.wikipedia.org/wiki/Autostereogram

[2] http://en.wikipedia.org/wiki/Random-dot_stereogram

[bfrs]

a simple autostereogram:

   1     1     1     1     1     1     1     1     1     1     1     1
   
   2      2      2      2      2      2      2      2      2      2   
   
   3       3       3       3       3       3       3       3       3  
   
   4        4        4        4        4        4        4        4   
   
   5         5         5         5         5         5         5      
   
   6          6          6          6          6          6          6
   
   7           7           7           7           7           7