Illusions can be based on an individual’s ability to see in three dimensions even though the image hitting the retina is only two dimensional. Just as it perceives color and brightness constancies, the brain has the ability to understand familiar objects as having a consistent shape or size. Unfamiliar objects, however, do not always follow the rules of shape constancy and may change when the perspective is changed. Continue reading to see eighteen more unusual optical illusion tattoos that will make you look twice.
