Kind of what you can expect to see. (via)

Not everybody can see those autostereogram illusion images. You know, those seemingly random pictures of visual noise which, when you cross your eyes in just the right way, reveal a 3D rendering of a shark or a horse or a goatse (NSFW, especially if you have a boss who is wont to stopping in front of your desk and squinting fiercely at your computer screen). Yeah, those things!

I personally could not see them at all for the longest time. Then, one day, something just clicked in my brain, and now it's almost like I can see the magic thing inside without even trying.

Sources: Young Rival | h/t Daily Mail