Think you can trust your eyes? Think again. What feels undeniable at first glance is sometimes a surprise, an illusion, or an ...

While new optical illusions go viral all the time, here are some of the most famous illusions that have kept us scratching our heads for years.

THE WINDIEST DESERT — What's your favorite optical illusion? Famous examples include the Ames room, the Ponzo illusion, the Zöllner illusion, the Kanizsa triangle, the Müller-Lyer illusion and the ...

Optical illusion challenges have always been interesting as they show how easily our eyes and brains can be misguided. Such puzzles are not only fun but also test how observant and focused people are.