Clement Greenberg, the leading American art critic of the 1950s and 1960s, championed Kenneth Noland’s work. This unusually long, thin painting by Noland exemplifies Greenberg’s arguments for an austere vision of art, based on his view that artists should focus on the specific qualities of their medium that are unique, which for painting meant colour and flatness. As Greenberg wrote in 1961, ‘The essence of modernism lies, as I see it, in the use of the characteristic methods of a discipline to criticise the discipline itself, not in order to subvert it but to entrench it more formally in its area of competence.’