Your eyes can paint colours 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 colourful world. Each building will have its own nuanced colour. Magic!
It's the powerful effect of afterimages. The optical illusion, spotted by Charlie White, is an old favourite. By focusing in on the dot, you're sort of temporarily burning your retina in with different colours. Once the illusion flips white, your eyes will still see the after effect of the colours. Ain't it always fun to screw with your eyeballs?
For the best effect, click the expand button on the image below: