The pyramids were tombs for the Pharaohs to ensure his immortality, built by the Egyptian populace. The idea
was to establish the never-ending existence of the Pharoah.

The pyramids were built based on a gigantic delusion...establishing the origin of Western Civilization. Prodigious energy and enormous financial resources were diverted from concrete existence and devoted to these monumental structures.

This delusion set the stage for subsequent civilizational delusions that characterized Western civilization. 

Richard Koenigsberg

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PBS: Pyramid: David Macaulay: The Pharaoh Khufu giving instructions to his Scribe: “You will build me the greatest pyramid of all. So that no one who sees it can doubt the power and the glory of the King of Egypt. From now until the end of time.”