A simple letter swap in a viral puzzle is testing the limits of focus and perception as users race to find the hidden word.

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

An optical illusion has been shared on Reddit that is so needlessly creepy it made me shiver. The illusion itself is mind-boggling and makes you want to watch twice, but it's the presentation of ...

Test your mind with a fun optical illusion! Hidden among a sea of 'o's is a sneaky '0'. Spotting it reveals whether you're more creative or logical. Quick finders are analytical, detail-oriented ...