The Ames Window: The Illusion That Keeps Working Even If You Know What Happens

If you're reading this, it's because you've come back for more: You want an optical illusion that melts your brain. From the black-and-white image "in color" to the mystery of the twelve dots, passing through the balls of the same color and the strawberries that are not red, the differences between what we "see" and what actually happens can be very large. A striking example is the so-called Ames Window. Despite its simple design, our brain insists on interpreting that the window is swinging, when in fact it is spinning normally…

Visualize a window. Small, large, old, modern, closed, or open wide, it doesn't matter. The point is that your mind has a highly developed idea of its format, to such an extent that you can recognize them immediately, and the same happens with their features. The "normal" expectation is a rectangular window made of wood or metal, with one or several glass panes. However, the problem is that under very specific conditions, those basic ideas fall apart…

Welcome to the Ames Window, a creation of American scientist Adelbert Ames Jr., better known for the room that bears his name. So, what's happening here? The window seems to be swinging, a classic motion very close to 180 degrees… but that's not true. The window always spins in the same direction. You can even attach different objects for a better reference, and yet the effect remains intact.

The Ames Window led some psychologists during the sixties to develop the hypothesis of "transactional ambiguity", which holds that a person's mental expectation could affect the perception of an ambiguous stimulus. In more relaxed terms, the illusion works only because we know what a window is, and how it's made.

Want to reproduce this window at home? Easy: Cut a piece of cardboard in the shape of a trapezoid, draw the window's physical features on both sides of the cardboard (trying to make them identical), and cut out the holes. The rest is a matter of hanging the window with a thin thread, or connecting it to a small motor. As both videos show, the illusion gains a bit more strength if it has a uniform color behind it.