Pareidolia (/pær??do?li?/ parr-i-doh-lee-?) is a psychological phenomenon involving a vague and random stimulus (often an image or sound) being perceived as significant, a form of apophenia.
For example, a series of shapes and lines which, despite not bearing much resemblance to a real face, is likely to be compared to one by a human observer.
Other examples include seeing images of animals or faces in clouds.