Frank wanted his buildings to be part of it’s surroundings, and make use of the native, local materials as much as possible.
Falling Water is a good example of that philosophy.
We did the tour there a few years back, it’s...different.
I like that philosophy and it works really well with that style. He also used some really old time features like having the foundation let water flow through it. He also didn’t want buildings on a summit but rather to be part of the landscape.
Sometimes though being at the top works. The Parthenon in at the summit of the Acropolis. It looks right there.