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D'Arcy Thompson explored in great detail the reason that bilateral and radial symmetry seem to be the only known body plans. But anyway it's a moot point, because there's a difference between self-awareness and body plan. One is a structural element, and the other is an inherent property (I think an apt analogy would be to compare a specific molecule with the charge on an electron; one is a possibility among many, and the other just is). I don't see why it follows that there must be a grand design, plan, or purpose, if we admit that consciousness might be a property of the universe. It only implies agency, not direction.