People have always been intrigued by illusions, but only in the last century have they been able to teach us about the workings of the brain.
Optical illusions appear when our brains have trouble moulding raw sensory data into shapes and patterns. Designers have been exploiting this process for centuries.
To learn about how humans, animals and insects experience vision illusions, we had to find a way to ask bees what they saw.
Visual illusions provide an inkling of the mental processing that delivers our experience of the world.