Optical Illusion: 6 intriguing optical illusions could improve

Psychologists at the Universities of Glasgow found that staring at an optical illusion can improve visual acuity and allow you to see small print.

Optical illusion: Can you help us to spot number 9 in THIS image

Tongue twisters: Here are 10 of the toughest and trickiest tongue twisters to try - including in Gaelic and French

Seckel, Al: 9781554071517: Books

Optical Illusions: The Science of Visual Perception

Why your mind loves optical and visual illusions, explained by psychology, Optical Illusion

Optical Illusions Art Gallery - Little Passports, Optical Illusion

Optical Illusion Activities for Kids - Little Passports

Optical Illusions Art Gallery - Little Passports

10,700+ Moving Optical Illusions Stock Photos, Pictures & Royalty, Optical Illusion

How the time of year could affect what you see in some mind-bending optical illusions, Optical Illusion

How the time of year could affect what you see in some mind

How Does the Human Eye Interpret Optical Illusions?

Optical Illusion: Can You Spot the Hidden Woman's Face in This Art