“The brain is really a predictive organ,” said Nouchine Hadjikhani, a neuroscientist at Harvard University. “We try to find sense in the noise all the time, and we fill things with information.”
The phenomenon of seeing faces where there are none is a form of information-filling called pareidolia. It’s something all humans do.
Perhaps now we know why birthers see a smiley face in the signature stamp of President Obama’s Long Form Birth Certificate?