This post is by David Hobby from Strobist
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Quick, guess the lighting.
If you said two lights, and use of high-speed sync to get the shallow depth of field, that's a pretty good guess.
If you said zero lights and a rigid high-efficiency reflector, that's an even better (and correct) guess.
When working with an inexperienced assistant — or looking to introduce someone to the world of off-camera lighting — a rigid/high-efficiency reflector is a fantastic and inexpensive place to start.