The Chubb Illusion is an optical illusion created by British psychologist Richard Chubb in the early 2000s. It involves a series of black and white circles that appear to move when viewed from different angles. The illusion is created by the way the circles are arranged and the way they interact with the
From Wikipedia
The Chubb illusion is an optical illusion or error in visual perception in which the apparent contrast of an object varies substantially to most viewers depending on its relative contrast to the field on which it is displayed. These visual illusions are of particular interest to researchers because they may provide valuable insights in regard to the workings of human visual systems.