Patrick Heron's work is devoted to the analysis of natural forms and colours. From his abstract works, particularly those made up of horizontal or vertical stripes to his softer-edged shapes, he regularly uses colour to express the pleasure of sight as one of the most important human senses. Although working in the European tradition, one can also see aspects of Jackson Pollock, Mark Rothko and Willem de Kooning in Heron's work. As well as painting and tapestry design, he has also designed a stained glass window for the Tate Gallery in St. Ives and designed a kneeler to encircle the Henry Moore altar at St. Stephen Wallbrook in London.