Absolutely WOW!!!!

Words of director Alfonso Cuaron: "You have a character who's drifting into the void and is getting farther and farther away from human communication. It's a character that lives in her own bubble and is a victim of her own inertia. So it was a moment in which she has to come out of her own bubble and metaphorically shed her skin. She gets out of that suit and soon she's in her primordial state. The film deals with rebirth, and this is the first hint of that - the first moment that it's done visually in a more explicit way. This is a character who's been surrounded by death and, on the verge of it, finally finds peace and repose." 

I went to see it without seeing the trailer, and I recommend not to. Amazing...