This optical illusion is going to blow your mind. It's a fun, super-hard brainteaser that's blowing up Facebook.
You'll either get it in a second, or you'll be scratching your head trying to figure it out. Do see anything unusual on the wall?
Here's the optical illusion. See if you can figure it out. The answer is on the next page. (Like brainteasers? Find a lot more fun brainteasers here.)