There are puzzles to solve and mysteries to unravel… and then there are the mindboggling optical illusions that play with your perception.

Stationary things move, items big and small end up being the same size… it’s simultaneously fascinating and a little unnerving.

The folks as Gizmodo assembled a gallery of twenty optical illusions of all sorts, including several favorites of mine like the Fraser Spiral and a neat variation on the Necker Cube, and you should definitely check it out, if only to challenge your eyes and your brain in a different way today.