Years ago, I noticed my first wrinkles. My face was a physical record of a life spent in the California sun. Disturbing, yes, but what could I do to make myself feel better about them? My solution was to draw a self-portrait accentuating every wrinkle on my face. While drawing my forehead, I became curious as to why the 'frown lines' between my eyebrows were of different lengths. I saw a deep, long vertical line on one side and another deep vertical line, only half as long, on the other. Why were they different from each other? Why were they so much deeper than my other wrinkles? From that...