The Backrooms Is Actually One Giant MRI Machine
Async mentions they used to make MRI machines, and that detail feels important. MRI machines scan the body using magnetic fields and radio waves, but if you move, the image becomes warped and distorted. That sounds a lot like the Still Lifes, which look like broken human scans.
The movie says the Backrooms “misremembers reality,” but it’s actually scanning and rebuilding reality imperfectly Instead of just copying people, it feeds on their memories, emotions, and surroundings. That explains why Clark’s furniture store keeps appearing with familiar objects like his co-workers’ shoes, the throne, customers, and even his wife.
This also explains Captain Clark and Mary. Clark spent so long trapped there while mentally broken that the Backrooms may have absorbed his trauma, creating Captain Clark as a distorted version of his mind. When Mary enters, it does the same by recreating scenes tied to her childhood trauma. So The Backrooms is basically one giant MRI machine constantly scanning, feeding, and rebuilding reality into terrifying distorted versions.