Western painting critic Robert Coates. Abstract expressionism, Action painting, and Color Field painting are synonymous with the New York School. Technically Surrealism was an important predecessor for Abstract expressionism with its emphasis on spontaneous, automatic or subconscious creation. Jackson Pollock's dripping paint onto a canvas laid on the floor is a technique that has its roots in the work of André Masson. Another important ear<nowiki>ly m</nowiki>anifestation of what came to be abstract expressionism is the work of American Northwest artist Mark Tobey, especially his "white writing" canvases, which, though generally not large in scale, anticipate the "all over" look of Pollock's drip
Drip painting paint was less viscous than traditional tubes of oil paint, and Pollock thus created his large compositions horizontally to prevent his paint from running. His gestural lines create a unified overall pattern that allows the eye to travel from one of the canvases to the other and back again. Sources for the drip technique include Navajo sandpainting. Sandpainting was also performed flat on the ground. Another source is the "underpainting" techniques of the Mexican muralists painters. The drip–splash marks made by mural painter David Alfaro Siqueiros allow him to work out his composition of a multitude of Mexican workers and