This image contains a horse which you need to spot within 15 seconds of viewing time. The problem presents itself as a ...

The op-art loving side of the internet has developed a new obsession – the reverspective optical illusion. Taking Reddit by ...

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.

Professor Michael Bach works in the research department at the University Eye Hospital in Freiburg. Through vision-related pathologies, he has taken a very close look at how the eye works and the ...

An optical illusion is a visual phenomenon where our perception of thinking about an image differs from objective reality. This image is seen as an artistic forest scene designed as a hidden-object or ...

When later this year they resume their position high up in Van Eyck’s immense work, the paintings will never again leave St Bavo’s Cathedral, Ghent, where the altarpiece was once the centrepiece of a ...