“a mile-high skyscraper that makes the Burj look like a Burger King.”
Anyone with even basic sketching abilities can do that. FLW was an architect, not an engineer which is why places like Fallingwater have so many problems as a functional living space. You had to conform to his ideas, even the furniture and dinnerware were designed by him in some homes and were never ever supposed to be changed or even moved in some cases
Anyone can dream up wonders, even mad poets:
“Pish, what is a million dollars? I have spent more than that in an idle afternoon’s dreaming.” Navarre from Jack Vance’s novel “The Palace of Love”