Your eyes can paint colors onto blank objects. I swear! Just stare at the red dot in the optical illusion above for 10 seconds and you'll see the black and white cityscape be transformed into a brand new colorful world. Each building will have its own nuanced color. Magic!
It's the powerful effect of afterimages. The optical illusion, spotted by Charlie White, is an old favorite. By focusing in on the dot, you're sort of temporarily burning your retina in with different colors. Once the illusion flips white, your eyes will still see the after effect of the colors. Ain't it always fun to screw with your eyeballs?
For the best effect, click the expand button on the image below: