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You're right, no human being stacks rocks like this.
(lemmy.world)
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I don't think that's "the current theory".
I think you might be talking about digging canals. It's conceivable that a canal would be built to take the rocks to the construction site. Just recently however we've found evidence of a tributary of the nile that flowed past the sites of a number of pyramids.
I've read tributary as trebuchet first and was equally impressed and confused for a moment.
Just launching them to the top with extreme precision so they land right into their spot.