In 1978, I was in the fifth year of the six-year Medical Scientist Training Program leading to MD and PhD degrees at Emory University in Atlanta, Georgia. It was a rigorous program, but I found time to also pursue my favorite hobby since childhood, photography. I took a series of advanced photography classes at the Callanwolde Community Arts Center, culminating in a course on the zone system. The zone system was developed by photographers Ansel Adams and Fred Archer in 1939–40 as a way to focus attention on the shades of gray in a black and white photo through careful use of a spot light meter, a good eye for natural light, and sometimes careful dodging and burning during exposure of the final print in the darkroom to lighten or darken areas of the image that might need tonal adjustment. Every print created with the zone system is unique.