In the late 1940s Jackson Pollock developed a revolutionary form of Abstract Expressionism by dripping, pouring, and splashing paint onto large-scale canvases. Pollock emphasized the expressive power of the artist’s gestures, materials, and tools, often applying paint with sticks, trowels, and palette knives instead of brushes. He also challenged the concept of easel painting by working on canvases placed either on the floor or fixed to a wall. With no apparent beginning or end, top or bottom, his paintings imply an extension of his art beyond the edges of the canvas, engulfing the viewer. Among the last great purely abstract paintings Pollock made before his untimely death in 1956, Greyed Rainbow is a quintessential example of action painting. The paint application ranges from thick chunks squeezed directly from a tube to thin, meandering lines poured from a container with a small hole or squirted from a baster. The work is predominantly black, white, gray, and silver; in the bottom third of the canvas, however, Pollock thinly concealed orange, yellow, green, blue, and violet. The title of the work presumably refers to these grayed sections of hidden color.