For morning activities today, Division 5 looked at the optical illusion of the Ames Window. The Ames Window is a flat trapezoidal shape that, when rotated, appears to be a rectangular window oscillating back and forth. It’s an illusion because the brain perceives something that isn’t actually happening; it interprets the changing perspective as oscillation rather than continuous rotation.
Here is the video below. The first part of the video explains how to make your own Ames Window, and the demonstration starts around the 1:50 point. Pretty cool!