The original China Ball illumination is omni-directional, unless used with a black screen. When using a China ball as a somewhat shine-through umbrella replacement, we wish to add some sort of directivity to the light-source.
The frame of the China ball helps a great deal. Aluminum foil can be fixed to the frame to re-direct light to the "front" of the ball.
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Simple reflector for the light-source in a China ball |