Illusion is derived from the Latin verb illudere, which means to mock or trick. Optical illusion pictures are designed to trick the human mind and are regarded as one of the simplest tests to ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...

Have a look at this image. Do you perceive that the central black hole is expanding, as if you’re moving into a dark environment, or falling into a hole? If so, you’re not alone: a new study shows ...

A stereogram optical illusion is a fascinating visual puzzle that hides a 3D image within a 2D pattern. At first glance, it appears to be a random collection of repeating designs or colourful dots.

If you are a big optical illusion aficionado and think you have seen it all, it's time to reconsider. Because this optical illusion is not just puzzling for the brain, but also tricks human reflexes ...

A mind-boggling optical illusion can trick the brain into thinking a static black hole is expanding, researchers have shown. This 'expanding hole' illusion, which is new to science, has been created ...