The Diary of Merer describes the last years of building the Great Pyramid of Giza.
(Origin of the Bible handout by my small group leader, February 8, 2023. Summarized from Wikipedia. Page 1.)
In biblical cosmology, the pyramid is finer, lighter, flimsier, and is closer to intangible heavenly meaning, while the bottom is bulkier, stronger, darker, and is closer to material support.
(The Language of Creation: Cosmic Symbolism in Genesis - A Commentary by Matthieu Pageau, 2018. Pages 39-42)