The possible answer is a (even a slight) understanding of the way the human brain works. We are "geared" to see patterns in everything, probably stemming from the genetic necessity for babies to recognise faces almost before anything else. This weakens as we get older but it never dies out, and so we 'see' many things by forming a pattern that has meaning out of something that is completely random. People see the face of Elvis or Jesus or whoever in some item of food they've bought, or in clouds, or anywhere really. The picture below illustrates this perfectly: