Images that can be interpreted in a variety of ways have existed for many decades, with the classical example being Rubin’s vase — which some viewers see as a vase, and others a pair of human faces.

Numerous visual illusions are caused by limits in the way our eyes and visual neurones work -- rather than more complex psychological processes, new research shows. Numerous visual illusions are ...

The optical illusion seen above makes the viewer feel as if they are falling into an expanding hole – and now we have a good explanation for why this happens. To investigate whether the expanding hole ...