Many of the poses and compositions were probably borrowed from Chinese ink paintings, and here they come together in a dynamic composition of black birds clustering on land and flying in midair.

WSJ: Flights of Feathered Fancy | Birds in the Art of Japan | Metropolitan Museum of Art | By Lee Lawrence

Porter maintained that countries do well economically in large part because of this clustering of specialised skills and industries that, through dynamic competition between them, produce superior products and processes.

ECONOMIST: Guru