The bar was S-shaped, which allowed the hoop to pass in a figure-of-eight, giving the illusion that it’s moving in a straight line when looked at from the audience. The part most people don’t ...

Op Art, also known as optical art, is a type of art that features optical illusions. The way that lines ... The viewer's eyes constantly move over the images and this creates feelings that ...

Some visual scientists think this is due to fixation jitter: eye movements that give the illusion that objects near what you’re focusing on are moving. Which of the two circles in the centre is ...