Optical illusion post

Instructions: View the two videos (see below), then select one illusion for the post Give the illusion's name / describe what it is like or provide a link. Provide any research or information on how the illusion works. Why does the illusion work? How does it work? What does it tell us about how human’s process information? Videos: View: Optical illusions show us how we see (16 min). View: 25 Insane Optical Illusions that will Leave you Dazed and Confused