But if you struggled to find the hidden letter, don't worry. Optical illusions like these are designed to be deceptive, and with experience, your eyes will be trained to spot such things.

Optical Illusion test that sharpens your mind: Find the odd symbol in this photo and recharge your brain Look for common differencesThe odd letter is often one that closely resembles "C" to make ...

He was the winner of the Best Illusion of the Year Contest in 2010 and 2nd place in 2016. Follow TI: On Facebook More from Tech Human eyes could be easier to trick than you might think.

but Patrick Hughes' mind-boggling 3D art takes the concept to a whole other level. Hughes uses a style he created called "reverspective," painting uncanny optical illusions of a rooms with an ...