Thats's from Wright's big pointy object period. Several of his unbuilt designs, including Broadacre City and the Arizona state capital, included big pointy objects. The Marin Civic Center was the only completed project where the big pointy object [1] was built.
The spire in Scottsdale is also a big pointy object that was completed (but long after he died). Looks like it was originally meant to be at the state capital, so perhaps it's the same one you're referring to?
Actually, it's not about pointy, but about the high rise as a building type - structure as a tall tree. Wright's prototype for this is Price Tower in OK [1]
[1] https://media-cdn.tripadvisor.com/media/photo-s/26/a4/cb/8f/...