The "magic angle" of a cube, which is approximately 70.53 degrees, serves as a fundamental geometric constant that remains unchanged regardless of the cube’s size. This consistency is rooted in the cube's perfect symmetry, which ensures that all internal components scale at a fixed ratio. However, this stability is lost when transitioning to a rectangular prism, as breaking the symmetry makes the angle dependent on the ratios of the differing side lengths. The impact of extreme aspect ratios illustrates this sensitivity: stretching the shape into a tall, thin pillar forces the diagonals to become nearly parallel, causing the angle to approach zero degrees. Conversely, widening the shape into a flat plate causes the angle to open up significantly, demonstrating that a shape's proportions act as a weight that dictates the "closeness" or alignment of its central paths.
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