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I'm sure I've heard it suggested that the ruts were initially shallowly hand-carved to allow stone spheres to roll along them upon which heavy loads could be transported. Constant use would eventually deepen them naturally.
It might be an elegant solution in an environment lacking wood.
Edited 1 time(s). Last edit at 27-Nov-17 19:26 by Harry Wolf.
It might be an elegant solution in an environment lacking wood.
Edited 1 time(s). Last edit at 27-Nov-17 19:26 by Harry Wolf.
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