… A psychological phenomenon involving a stimulus (an image or a sound) wherein the mind perceives a familiar pattern of something where none actually exists.
Common examples are perceived images of animals, faces, or objects in cloud formations, the man in the moon, the moon rabbit, and hidden messages within recorded music played in reverse or at higher- or lower-than-normal speeds. (Wikipedia)
Meaningful patterns in meaningless noise. The photos have been taken mainly in Cornwall and Devon.