Wright designed more than 1,000 structures and completed 532 works. Wright believed in designing structures which were in peace with humanity and its environment. He called his belief organic architecture. He used this technique for his design for Fallingwater (1935), which has been called "the best all-time work of American architecture". Wright was a leader of the Prairie School movement of architecture and developed the image of the Usonian home, his one-of-a-kind vision for urban planning in the United States.