However, there’s a sneaky "10" cleverly placed somewhere in the design, and only the most eagle-eyed viewers can spot it. Optical illusions have long fascinated both scientists and everyday ...

An optical illusion shared on Facebook challenged viewers to count hidden faces in a black-and-white silhouette.

Social media is flooded with brain-teasing optical illusions. One viral challenge involves finding a hidden 'HORSE' in an image of a horse. With only 10 seconds to solve it, many struggle, but those ...