Humans are pattern-seeking, storytelling animals. We look for and find patterns in our world and in our lives, then weave narratives around those patterns to bring them to life and give them meaning. Such is the stuff of which myth, religion, history, and science are made.
Sometimes the patterns we find represent reality — DNA as the basis of heredity or the fossil record as the history of life. But sometimes the patterns are imposed by our minds rather than discovered by them — the face on Mars (actually an eroded mountain) or the Virgin Mary’s image on the side of a glass building in Clearwater, Florida (really an oil stain from a palm tree, since removed to enable the faithful to better view their icon). The rub lies in distinguishing which patterns are true and which are false, and the essential tension (as Thomas Kuhn called it) pits skepticism against credulity as we try to decide which patterns should be rejected and which should be embraced. 
- Shermer, Michael. “Chicken Soup for the Evolutionist’s Soul.” A review of Robert Wright’s Nonzero: The Logic of Human Destiny. February 2000. http://www.michaelshermer.com/2000/02/chicken-soup-for-the-evolutions-soul/ [↩]