Exercises w Depth of Field

I photographed John at a photography workshop where I was teaching lighting technique in an cramped tiny space where there was little to work with. I set up 3 lights- the key light all the way down to its minimum and the other 2 lights just slightly higher. The subject was sitting in an ordinary chair and were shooting against a large white board. I was demonstrating extremely shallow depth of field shooting at f1.4. This is something I could play endlessly with and never get sick of. It seems to work especially well on portraits of people who have glasses or voluminous hair because there is extra depth to play with.