All of his colleagues respect his insistence on maintaining his own private space, and play along with his "walls" charade. Mr. Carlson even "knocks" by clicking his heels together, although Jennifer is permitted to ignore the imaginary walls.
All of his colleagues respect Mr. Carlson's need for personal space, and they participate in a playful charade involving imaginary walls. He "knocks" by clicking his heels, while Jennifer is allowed to disregard this symbolic boundary.