Optical illusion test: Blue, purple or red-- what's the colour of this dot and the science behind it

A biomedical optics engineer discovered a visual illusion where purple dots appear bluer in peripheral vision. This ...
Hosted on MSN

22 mind-boggling optical illusions

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 ...