In-motion optical illusions are visual phenomena that trick the brain into perceiving motion where none exists. These illusions use clever patterns, colour contrasts, and shapes arranged in specific ...

Hidden number and letter optical illusions are some of the most satisfying puzzles because they look unbelievably simple until you actually try them. In this challenge, you are shown a neat grid ...

Look closely at this picture. At first glance, you can see a big tortoise in the centre of the image. But look closer, and you will see multiple small tortoises camouflaged in the surroundings. Your ...