Optical illusion puzzles are quite popular because they challenge our observation skills, give our brain a little workout as ...

Optical illusions are older than you think. The first optical illusions date back to 20,000 BC and took the form of cave sculptings. Nowadays they are found all over the place – on screens, in books ...

There are countless types of optical illusions, from the cognitive to the physiological, testing our minds in ways that appear to defy logic. The latest example bewitching the internet is this simple ...