The Phi Phenomenon is a visual illusion that occurs when a series of still images are presented in rapid succession, creating the perception of motion. This effect is often seen in film and animation, where individual frames blend together to give the impression of continuous movement. This phenomenon was first studied by psychologist Max Wertheimer in the early 20th century, contributing to the field of Gestalt psychology. It highlights how our brains interpret visual information, demonstrating that perception can differ from reality when images are viewed in quick succession.