The topic of this week's illustration falls into my snail series, but pareidolia is not, strictly speaking, a fallacy. It is a psychological phenomenon that I feel underlies much fallacious thought, but also much creative thought. Pareidolia involves the human tendency to perceive a pattern or an organized image in a set of nebulous stimuli. The most common examples involve people seeing Elvis or the Virgin Mary among the shapes that appear on their pancakes or birthmarks, or in images of the surface of the moon. Rorschach inkblot tests make use of pareidolia in attempts to elicit material from the subconscious. Pareidolia can also invoke other senses by causing us to hear voices in radio static or heavy metal songs played backwards. Beneath pareidolia lies the urge to seek patterns and create meaning, to make a confusing and disparate world intelligible. The urge to think associatively--to seek patterns where patterns don't always exist--can be harmful or constructive. We see...