An interesting optical illusion

Back in 1951, scientist Adelbert Ames Jr. created one of the most impressive optical illusions. It became known as the "Ames Window."

It is a trapezoidal window, specially made so that the brain perceives it as a regular rectangular window seen at an angle. And when rotating around a vertical axis in one direction, it seems as though the window gradually slows down, stops, and then reverses direction, even though in reality it is continuously rotating the entire time.

And if you add pens to the center of the window, it completely breaks your brain.