We trust our eyes to show what’s really in front of us. But it’s surprisingly easy to trick them. And Patrick Hughes makes a living doing just that. He’s an artist whose paintings are truly mind-bending.

This one is called Paradoxymoron. At first, it looks like a fine painting of a library. It’s good. But it doesn’t look particularly special. Then as you walk by, it changes. You won’t believe your eyes. Hang on until the end to see how it’s done.