This image is based on a nightmare I used to have as a child, I would be trapped inside amaze with very high walls, too height to climb so I had to walk but all the time there would be a strange rolling sound like a huge metal ball running over glass, no matter where I moved the sound would get nearer and nearer until the huge ball became visible above me, it was at this point where I would always wake up with a huge jolt just as I was about to be crushed.
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