If you spot the seal in 5 seconds or less, congratulations! You have proven your visual discrimination and fast processing ...

It may look like a digitized Jackson Pollock painting, but hidden in this haze of color is a number — if you can see it. Puzzle lovers are going crazy for this head-scratcher optical illusion ...

The Terrell-Penrose effect, predicted in 1959, suggests that objects moving at speeds close to that of light appear rotated.

this mind-bending illusion is likely caused by a phenomenon called the Troxler effect or Troxler’s fading, in which gazing at a fixed point will cause peripheral objects and colors to disappear.

At least when it comes to creating an optical illusion that enables an object to take on the appearance of any other. It wouldn’t actually change shape per se, but it would be surrounded by an ...

Now, another such illusion has caught the internet’s attention — a seemingly ordinary mountain scene that conceals a well-camouflaged snow leopard. On Reddit, users were challenged to spot a ...