When looking at an upside down face, the eyes eventually appear to flip right-side up, giving the eerie impression that they no longer belong to the face. The effect is strongest when the eyes move in a direction unexpected for a right-side up eye.

The same is true of a mouth.

These demos were created by Jordan Suchow (suchow@fas.harvard.edu) and Maryam Vaziri-Pashkam (mvaziri.p@gmail.com). If you have trouble viewing them, contact Jordan.