Re-post #13: Pareidolia
"Pareidolia (pronounced /pɛɹaɪˈdoliə/ or /pæraɪˈdəʊliə/) is a psychological phenomenon involving a vague and random stimulus (usually an image) being mistakenly perceived as recognizable." Pareidolia(Wikipedia)
"F A C E S" a Flickr collection by JIMMICh. Pareidolia group at Flickr.
A book called "Faces". And another exampel. And my pareidolia photo.