Img source: phys.org/news/2018-07-reveals-great-pyramid-giza-focus.amp
I would be wary of disinfo here, but compare the research findings of the above with allegedly channeled information concerning the function of the pyramid shape in "The Law of One."
"Ra" says it can assist with meditation for an entity situated in the Queens chamber. Knowing that consciousness is electromagnetic in nature, perhaps the pyramid functions to focus electromagnetic information into the consciousness of the entity?