They are entering to the left of the screen here from the antechamber, which means that the Gold Room and this bathroom overlap - they share the same space. Like the window in Ullman's office, we're being shown an impossible room. The door Jack and Grady used out of the Gold Room must be a portal. The ceiling has the exact same extensions as the ceiling of the GOLD BALLROOM at center point. The color temperature of the overhead and mirror lights are spectral, hue-less, a quality only found in the Ullman office and Room 237's bathroom, other terminal rooms in the hotel with illusional space.