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read any books of 19th and early 20th century about Egypt sculpture and architecture. Nothing about angient Egypt is mystery. First pic is impressive but it's just stone carving in high relief. They probably had a smaller version made in wood to take the measures then rescale them for the monument, working like a slow cnc machine with a massive point measurement tool. the pyramids, literally legos but at larger scale. Anything was possible when you work for a powerful and rich Pharaoh. Ancient Egypt engineers and architects had a shit ton of skilled masons, slaves, resources and lot of time available.