This is such a mind f*ck

Wtf

i've been able to get these once in my life, and at the time i was unable to find any more than one

SIRDS (single image random dot stereo image) was all the rage for a while in the mid nineties. Haven't seen one in years.

COOL!!! :D

It's a scooner.

Aw, that's awesome! Didn't think that would work on a computer screen for some reason...?

Love these. There used to be books of them