Just picked up my Axis Mundi CW10, and had an interesting experience in the boutique. When I put it on, the SM and I both immediately noticed a lilac changeant effect! However, now that I've gotten it home, I can't seem to capture the color-shift that occurred in the boutique lighting.
Nonetheless, my guess, based on what the SM and I saw in the boutique-- and based on the colorway name-- is that this is a changeant mousse, but a very very subtle one because the color difference between the poudre and irise threads is not as dramatic as, say, the difference between the turquoise and fuschia threads in my Aux Portes, which has a very strong changeant appearance. Perhaps this would explain why
D Lee and I didn't notice a changeant while looking at this moussie on previous occasions.

Oh, the mysteries of Hermes....
Anyway, a few pictures in different lighting, from my failed attempts to show you all the changeant.