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Industrial Light & Magic uses Lama on all their productions, including on the photoreal skin in The Irishman (© Netflix).

Subsurface scattering is a way to create looks similar to skin, wax, and other surfaces where light penetrates and scatters inside the object. For example, when a candle is lit, the light from the flame also illuminates the wax itself, allowing light to pass through the wax. This is also why you can see sunlight through a person's ears or fingers when held against a flashlight. In subtle ways this is what makes skin appear soft and realistic.

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