Why are they cylindrical shape and not ball shape. Would that not be better for more random movement of the items inside and therefore be better for washing them?
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The highest centrifugal force (force made by spinning things) is at the edges, with a cilinder there is much more space at the edges than with a ball shape. This means that more clothes get the maximum force at once and more spread out over a large surface where all the water can get out. With a ball shape all of the clothes would kinda bunch up on those other side decreasing surface area covered.
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