Here’s an interesting little eye trick that was stumbled upon completely by accident.
An undergraduate student was going through photos of people’s faces for an experiment, when he noticed that if you stare at a certain point between two images, the faces in the photos become distorted.
According to researchers, the effect seems to take place when a focal point is aligned between the sets of eyes on the two faces. This causes the differences in the faces to appear more extreme. For example, if someone has a particularly large jaw, the effect will make it look ogre-like. If a face in a photo has a large forehead, the effect will make it look bulbous.
See for yourself: