"With humans you would say, "Don't stand over there." and that would probably work. With puppets, you can't stand over there because you would see the guy underneath. So it is a lot of foreground stuff."

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A background can be painted in the same range of values as the foreground by reversing the light effect. In the shadow plane, paint the lights cool and the shadows warm, and in the sunlight plane, paint the lights warm and shadows cool.

— Harvey Dunn