The first view inside The Overlook, and even though it's an interior, the set up and the structure as similar to the first shot in No.2, The Credits sequence.
Right away, Kubrick uses The Lobby’s compositional reflections to extend his messaging system into a new level. The colors in the curtains and the red couches are reflected in the art deco design on the floor. The left and right side of the frame have sets of couches in contrasting patterns, and the Z-axis has Jack and a hotel employee reflected.
The Lobby is also designed as a checkerboard, signifying the games that we will see play out across the film.
As Jack walks to Ullman's office, art work is reflected on either side of the door. On the left, an indigenous painting vibrantly colored. On the right, a photorealistic representation of the mountain shown across 4 seasons.
Inside Ullman's office is an impossible window showing trees. The location of the office would be an interior room, but the location overlaps with the elevator shown in the same space.