The particularly incongruent, yet oddly beguiling mushroom note that is at the heart of the original Musc is still subtly present (herbaceous, earthy patchouli), but patters out very quickly in order to give the bitterish salty semblance of naked skin which sweetens the more it stays on.
It makes me think of the words of E.E Cummings "in your most frail gesture are things which enclose me, or which I cannot touch because they're too near."
Further reading on Perfume Shrine:
Musk, the material: natural deer musk and synthetic musks
Skin scents: intimate and subtle
The Musk Series: Part 1, a Cultural Perception of Musk
Part 2, Natural musk and everything you need to know on synthetics
Part 3, The Many Permutations of Musk Fragrances (musk "types")
Scented Musketeers: musk fragrance reviews for men & women