A viral visual challenge is testing observation skills with an image containing eight hidden mistakes. Participants have just ...

This illusion – named Pinna's Illusory Intertwining Effect – first appeared in Shifts of Edges and Deformations of Patterns ...

Think it’s just grass? Look again. A buffalo is hiding in nature, and this illusion proves your brain can miss what’s right ...

Optical illusions use light, colour and patterns to cause a viewer to see something that's completely different to reality ...

An optical illusion is a riddle where the viewer perceives the image differently. These illusions come in a variety of types, ...

A cleverly hidden dog in a cosy living room stumped internet users as they struggled to spot it in an optical illusion shared ...

The hidden number '1513' is cleverly placed in the seventh row from the top, in the seventh line. It blends smoothly with the ...

Test your cognitive skills with this engaging optical illusion! Hidden among a sea of 'S' letters lies the number 5, and your ...

An 'accidental' optical illusion has left many people scratching their heads as they attempt to find the hidden detail in the ...

Test your vision and IQ with this optical illusion challenge! Spot all 11 hidden cats around the old lady in just 11 ...

For less terrifying optical illusion murals see these brilliant artworks made with a spray can. And if you want to continue ...

Optical illusions aren't just made for entertainment purposes, but they're a perfect way to test your knowledge as well as ...