Orange speaks to a heightened sense of energy and a warning. Because of it’s already vibrant nature, where there is orange it usually relates to Saturation as Emotional Intensity (link)
From rugs around The Colorado Lounge, to the famous 2nd floor carpet that wraps around Room 237, to a notice board where Wendy realizes the phone lines are down; orange shows itself where things are intense and only increasing.
The salmon color that covers both Ullman’s office and Halloran’s bedroom can be viewed as a shade of orange: signifying the danger inherent in both the space and the goings-on within them.
Image 566 orange (brown and red) hexagon pattern carpet
Image 560 star symbolism Native American rug
In this image · No.5
Ullman’s office is painted a pastel orange. It is similar to Halloran’s bedroom (No.48)