I know how it feels, took me several hours before I started seeing inverted (inside-out) image, sen several hours to see very blurry 3D, and after a day it snapped into crisp 3D image like magic. I've hooked since than.
Basically if you don't have issues with 3D vision, i.e. can see 3D movies, then there's nothing stopping you from seeing hidden 3D image.
Its good but personally all the colors destract from the animation its self. its confuseing to use copies of what ur animating as the mask. Idk if im useing the right words but i hope u understand what i mean.
haha its great i was interested in the stereograms around 12/15 years ago, for that reason all what i saw was printed in paper. Some hours ago when i was looking what you have done with my pattern i was thinking "arghj, doing this with the lcd monitor hurts my eyes" but, hey, this is the first time i saw an stereographic animation XD I never thought it was possible because sometimes a movement in the eye makes you loose the image now i go to search something i readed previously about a stereographic tetris XD
Man I stopped watching people so i didn't get a load of back up in my absence. I should have kept watching you! You're work has come such a long way and broken into grounds i didn't even know were possible. UR AMAZING!!