I figured it was wallpaper, but it's not. Her friend and artist, Kimberly Kae, is the Creative Director of Murorosso, and she hand-painted that amazing wall! Here are more pictures from their portfolio...
A dining room wall in an Upper West Side home:
A sitting room in Deal, NJ:
Custom stencil in mica powder in an Upper East Side foyer:
Gracie who? de Gournay what?