That's what it's supposed to be. The explanation assumes you already know what an "autostereogram" is and know how to look at them. There is a trick involved wh

That's what it's supposed to be. The explanation assumes you already know what an "autostereogram" is and know how to look at them. There is a trick involved where you focus your eyes on a point somewhere in space behind the screen instead of on the screen, and it suddenly acquires depth. https://en.wikipedia.org/wiki/Autostereogram https://en.wikipedia.org/wiki/Autostereogram will tell you more about this.