Tesla wrote a lot. Reading what he wrote takes a LOT of the speculation / legend / mystery out of it.

Don't know anything about the Pyramids and water... but Tesla talked about free energy in a very particular way and it was solar in origin...

Einstein as a kid was looking at dust in a beam of light shining thru a window and wondered "what would it be like to ride on a beam of light". and it set him on a quest that he was eventually to take the whole world on with relativity / special relativity... he denied the ether and argued with Tesla about it... he eventually came around a bit to Teslas way of thinking... but Tesla was dismissive of relativity and did not live long enough to see it proven.

Tesla was well into his career doing VERY impressive work with electric motors when he noticed it starting to rain right after a lightning strike... and he wondered "could I make it rain in a certain spot if I sent up a trigger electrical charge"

Then he would let the sun collect energy (water at a higher altitude than a generator set) and get that water to come down in say lake Erie...

THEN he thought of using the earth to store energy... like a tuning fork sympathetically ringing because of another ringing close to it...

That in conjunction with VOLTAGE being available at heights... you could pull energy FROM the earth in different places...

You could also communicate using the earth itself as a medium like a wire.

Buckminster fuller was very much a pragmatist with an incredible memory and capacity for thinking creatively and independently... even impressing Einstein himself... he used his hands as well as his brain, like Tesla...

Anti-gravity is usually attributed to "The Pinch Effect" of gyroscopes paired with very efficient / small energy sources (nuke maybe?)

Clif High is entertaining... but the Woo is not flowing... the earth is not flat.

We ARE getting our asses kicked by central banks tho...