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@futurebird Elaborating on "braid matter": There is a theory called "loop quantum gravity". It tries to make gravity quantum-physics-y (this is hard) by first developing a quantum theory of space. It works, but has a problem: It has no way to represent matter. So THIS theory suggests every piece of matter is a tiny persistent twist in spacetime. A bit of space got caught in a knot, and you can slide the knot along the "rope" but you can't untie it, unless it encounters another knot and rewinds.