Optical illusion: A concealed cat in a cluttered kitchen sparked a viral “find the predator” challenge on Reddit, leaving thousands squinting at their screens. Optical illusions have been all the rage ...

Initially uploaded by a user named KRothbauer on Reddit, this optical illusion became quite a hit on the internet. At first glance, you have a dull image of a garden: A white birdbath is surrounded by ...

A grayscale ballerina who appears to be moving. A human who can fit in a doll box. A black-and-white prism which appear to change shape when viewed from three different directions. Those are the top ...

Ever wondered if animals like sheep or goats see the world the same wacky way we do when we look at optical illusions? Turns out they do. A recent study led by Alina Schaffer at the University of ...