Like many other modern artists, throughout his career Munch liked to work and rework each idea insistently. For example, The Scream exists in three different versions, and Munch left at least five versions of Madonna. Even with different themes and variations, Munch's works always represent a fixation on the subject, and over time, they become elements of a series with a life of their own. From Claude Monet's search for natural light until his technique almost completely erased the subject of his Water Lilies, to Piet Mondrian's series of grids, to Jackson Pollock's stripped-down digital titles that somehow include both One and Number One, modernism has found in series both a point of origin and a free play that cannot cease.