optical illusion - Trivia, Quizzes, and Brain Teasers | Mental Floss

How 'Pepper's Ghost' Became the Toast of Victorian London

People in Victorian London were amazed by a stage effect perfected by John Henry Pepper that had them seeing a ghost.

How 'Pepper's Ghost' Became the Toast of Victorian London

When Magic Eye Pictures Ruled the World—and Frustrated Millions of People

In the 1990s, millions of people spent a lot of time staring at images like this one.

When Magic Eye Pictures Ruled the World—and Frustrated Millions of People

Can You Spot the Mouse Hiding Among the Squirrels?

Dudolf

Can You Spot the Mouse Hiding Among the Squirrels?

Can You Spot the Sleeping Bat Hiding Among the Tools?

Burton Roofing

Can You Spot the Sleeping Bat Hiding Among the Tools?