The latest optical illusion creator to go viral is Mimi Choi, a professional makeup artist based in Vancouver, Canada.

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 ...

At first glance, the image in front of you might look like it's full of nothing but the same repetition of the letters “HNAD.” The sameness is so strong that your brain might catch up with the pattern ...