tesseract

Something—something like a Klein Bottle—or a tesseract—or maybe both of them together.

A line has one dimension, a square has two, a cube has three, and a tesseract has four.

A cube can be unfolded into six squares, and a tesseract unfolds to eight cubes.

The hypercube or tesseract is described by moving the generating cube in the direction in which the fourth dimension extends.

When pressure is applied, it folds up into a tesseract so that it takes up less room and relieves the pressure.