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A silver object is going to reflect light, especially if directly lit. But the technique here was diffusion and feathering of the light. Feathering takes advantage of how light spreads before it fades. In this case, the light from a soft box is in front of the object and the spill off of that edge is lighting the subject. Just remember that light fades the farther it is from source (the “inverse ratio rule” if you want to look it up). So in this example the light is very close.