Large Fierce Mammal

Source http://www.frenblog.com/illusion/jesus-vs-satan-illusion/

A recurring theme in the horror genre is supernatural subterfuge that results in one person believing that another has become a monster, with predictably homicidal results. While such events are a matter of record, explained as arising from insanity, the human mind has yet to reveal all its dark secrets.

Behold the “flashed face distortion effect“, accidentally discovered by Dr Jason Tangen, Sean Murphy and Matthew Thompson from the University of Queensland’s School of Psychology. What follows is a video consisting of pairs of photos of the faces of women who are far from ugly, but focus your eyes on the cross at the center of the screen and watch what happens to your interpretation of the images as they flash through the sequence. Observing each face individually will confirm that none of them have been grotesquely altered, and only your own interpretation of the differences between them has been magnified by something that is going on as your mind interprets what has entered your eyes. Once again, don’t believe everything you see.