New Delhi, Aug. 1 -- Optical illusions trick you into seeing things that aren't real, like still images that appear to move or identical colors that look different. This happens because your eyes and brain speak a "simple language."

When your brain tries to fill in missing information quickly, it sometimes guesses wrong. For example, in the Hermann grid illusion, dark spots flash at white line crossings even though none exist.

Scientists say this mix-up occurs because your brain evolved to spot danger fast, like predators in bushes, which helps survival but creates visual errors.

The famous Muller-Lyer illusion shows two equal lines appearing different lengths because of arrow-like tails. This "distorting illusion" proves your brain ju...