Beginning with abstract expressionism, which understood itself primarily as a countermovement to constructivism and geometrical abstraction, a type of gestural-expressive painting makes a stand, for example in the works of its most significant representatives Sam Francis and Frank Stella. Another important characteristic referred to as “hard edge” emerges next in the two-dimensionality of the constructed fields of color of Leon Polk Smith, Charles Hinman, and Nicholas Krushenick. Finally, at the beginning of the 1960’s, Robert Rauschenberg and Jasper Johns gap the bridge from abstract expressionism to the materials and motifs of everyday life and thereby establish pop art. Andy Warhol’s portraits of his contemporaries and historical personalities are seen as the epitome of pop art and simultaneously make up the focal point of pop art in the HEUKING collection.