| http://www.w3.org/ns/prov#value | - Light entering the skin is blocked by the bone before it can go right through to the other side (except where there is no bone, e.g. the ear), so what is important for the look of skin is the sub-surface multi-scattering: where a photon enters the skin, bounces around a bit changin its colour and intensity, then leaves the skin in a different place.
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