Interesting play on how we read human faces. Start with the eyes and move outward somewhat randomly looking for other points of recognition.
The trick here is the eyes, which are the starting point in facial recognition. In a facial set, one's visual cortex normally focuses on a set of eyes as a starting point, and then randomly moves outward looking for other points of recognition.
Whoops, another set of eyes! The brain becomes somewhat confused.
Proof. Put your thumb over the eyes in the picture, everything comes into clarity; put your thumb over any other part of the face, and the multiple sets of eyes can still confuse the mind.
"Beer is proof that God loves us and wants us to be happy."