Comment by 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