A new optical illusion is going viral online, forcing people to put on their thinking caps to solve the puzzle. It shows three straight horizontal lines stacked vertically and asks a basic question: ...

The optical illusion challenge for the day needs people to put on their thinking caps to find the correct answer. All you get to witness here are two lines and a simple question: Which line is longer?

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 ...

Artists and scientists have been creating optical illusions for centuries. Here are 35 mind-bending examples that prove you can't always trust what your eyes are telling you. When you purchase through ...

Optical illusions play on the brain's biases, tricking it into perceiving images differently than how they really are. And now, in mice, scientists have harnessed an optical illusion to reveal hidden ...