Optical illusions are older than you think. The first optical illusions date back to 20,000 BC and took the form of cave sculptings. Nowadays they are found all over the place – on screens, in books ...

Everyone loves an optical illusion — even if they leave us completely stumped — and they're all around us in the natural world. From an underwater waterfall in the Indian Ocean to a surrealist scene ...

This is the amusing moment an awesome optical illusion fish tank made it look as if a cat was inside. The pet-loving owner bought the custom-made glass aquarium for Milo, the Persian feline, and her ...

When looking at this patch of lawn head on, it looks like a sphere just sitting in the middle of the plaza at Paris City Hall. But it isn't. Look at it from the side and you realize that it is just ...