Among artists who had more than 20 connections within these networks are Alfred Stieglitz, Tristan Tzara, Filippo Tommaso Marinetti and Natalia Goncharova whose origins were American, Romanian, Italian and Russian, respectively, yet who moved about freely, with bases often in Paris, but also in New York, Zurich and Munich.

WSJ: The Concrete Challenges of Abstraction | Inventing Abstraction | By Tom L. Freudenheim