The Müller-Lyer Illusion

The Müller-Lyer Illusion involves two lines of equal length, but one appears longer than the other due to arrow-like tails at their ends. When the fins point inward, the line seems shorter; when they point outward, it seems longer. This occurs because our brains interpret the tails as cues for depth and perspective, affecting our perception of size. The illusion highlights how visual context and assumptions about three-dimensional space influence our interpretation of two-dimensional images, causing us to perceive equal lines as different lengths despite them being identical.