This photograph shows Jackson Pollock at work...just look at the mess he is making on the floor!
He dripped paint onto large canvases on the floor. This way of painting was called action painting because Pollock would move very quickly across the painting, dribbling the paint in long, wobbly lines. Sometimes he threw the paint onto the canvas – and some of his paintings still have footprints on them from when he stepped in the paint.
Pollock was born in 1912 in Wyoming in America. When he was eighteen he moved to New York and trained as a mural painter. This meant he was used to working on a very large scale and so the idea of painting on a big canvas didn't scare him at all.
In 1943 a very rich art collector called Peggy Guggenheim asked him to make a mural for her. Pollock was so excited that he ripped down a wall in his house so that he could fit a huge 20 foot canvas inside. Peggy was very pleased with the painting and she invited him to have an exhibition at her gallery.