The human visual system can create an illusion of three dimensions when presented with two dimensional images.
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Structures can be built by interlocking pieces for strength.
Balls roll in elliptical pathways around the dish, until they fall into the 'gravity well's' central hole.
Mass and weight may be interchangeable terms, but weight relies on force applied to a mass by gravity.
Your visual system interprets the position of shadows to judge whether something is a 'dent' or a 'bump'.
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