Optical illusions are a tricky yet fun way to exercise the brain. The puzzles are often designed in a way that the person ...

The photo shows dozens of translucent round beads glowing under a white ring light, each one catching rainbow reflections.

Prior research has produced mixed results on the question of animals and their susceptibility to optical illusions, per the ...

Test your observation skills with a train image challenge. Find three subtle differences within 12 seconds. This visual ...

Have you ever looked at two circles of exactly the same size and sworn one was larger? If so, your eyes have been tricked by ...

Optical illusions come in many different forms, from the perplexing to the mind-melting, but op art doesn't always have to be headache-inducing. Representing the serene side of op art, Larry June's ...

Duping a guppy is easier than duping a ring dove — at least when it comes to a classic optical illusion.

Allen Institute researcher Jerome Lecoq points to one of the diagrams that was used in a study focusing on how the brain interprets optical illusions. (Allen Institute Photo / Erik Dinnel) Our brains ...