on shapes:

They are unique elements in a unique situation.

They are organisms with volition and a passion for self-assertion.

They move with internal freedom, and without need to conform with or to violate what is probable in the familiar world.

They have no direct association with any particular visible experience, but in them one recognizes the principle and passion of organisms.

-- Mark Rothko Possibilities no. 1 (Winter 1947-1948)