Joseph Clift on what tips us off:
[I]t’s the backdrop that gives the scene a dream like - nightmare-like? - quality. The walls of the room, the curtains, the mirror reflecting the light, are all barely painted in, compared to the carefully-worked textures of the furnishings. They’re bathed in a flat vanilla shade, though part of the wall is underlaid with flatter beiges and greys, the exact colour of a bruise.
