just as that canvas, by turning its back to the spectators, folds itself in against the picture representing it, and forms, by the superimposition of its reverse and visible side upon the surface of the picture depicting it, the ground, inaccessible to us, on which there shimmers the Image par excellence, so does the window, a pure aperture, establish a space as manifest as the other is hidden; as much the common ground of painter, figures, models, and spectators, as the other is solitary (for no one is looking at it, not even the painter).