These are called stereograms (stereoscopic images). Inside each one is a hidden image of an animal that will become obvious to you once you just learn how to look at it correctly. It's going to drive you nuts at first, but keep trying.

Once you learn how to see one, you'll know how to see them all. These images come from a challenging Instagram account called @3dopticalillusions. Check out the account for more practice!

If you just can't figure it out, share with your friends for help. Crowdsource these bad boys. Good luck!