If you stare at both of the pictures, it looks like they are moving. Some of the oldest illusions use simple colors and shapes to trick our sense of scale and perspective. Scientists now know that biological eyesight involves a complicated neurological network that, can give us false information sometimes. Scientists still have much to learn about optical illusions, but the information found out so far is very impressive.
Fun Eye Test." Vision Test Games RSS. N.p., n.d. Web. 17 Mar. 2015