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Mike, after looking around and taking your directions into consideration, I finally settled on the dining room. It is the only spot in the house with only one source of light. Because I have been doing this exercise early in the morning, the room itself is very dark at this time of day, not to mention the walls are painted black so there isn't much light bouncing off of walls. Being 5-7 feet back in that room resulted in very muted light, and while I could Identify aspects of your diagram, I needed to move toward the window about 3 feet to get more visible results. Once there it was interesting to see that just the slightest variation in movement resulted in quite a different "picture" should I have chosen to sketch it. I don't think I have ever thought that much about it before. If I moved too close to the light the whole hand seemed illuminated, and reminded me almost of looking at a picture of a hand taken with a flash, to move it farther away from my midpoint, while I could obviously still see the hand there were no shadows of interest. However while standing in the chosen spot approximately 3 feet, maybe 4 from the window, I could definitely see rounded forms all over my hand and arm that resembled your diagram. Each little part on my hand, the finger tips, the knuckles etc, had their own little areas of light zones and shadow zones. I then pulled a white blanket into that dark pit of a room and placed beside me opposite the window. The results were very similar, however it added more of a "glow" to the underside of the shadow zones.
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