While many mind-blowing optical illusions can play with your brain — such as this wild celebrity portrait — here’s one that could leave you blue in the face. [Warning: Spoilers below] The three ...

From colour-changing fire trucks to 'The Dress', many optical illusions have baffled the internet over the years. Now, a scientist from Harvard Medical School has discovered an illusion that might be ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. Illusions like these mess ...

Perception researchers have long known about the structural and functional features that differentiate our central vision from our peripheral vision. The central (or foveal) region of our retinas are ...