Pollock began to drip and pour paint in 1947. This work, in which streams of black and white enamels were poured onto the surface, shows the improvisatory possibilities of this method. The sweeping arc of Pollock's gesture can be seen in the liquid black, which has bled into the white painted background to become grey. This acts as a base over which the thicker white paint is deliberately woven. The effect is rhythmic but controlled, energetic but delicate. Although there was an element of chance, Pollock frequently emphasised the importance of decisions over the merely accidental.