Warhol at the Factory, 1965 Warhol poses with a piece from his series Cow Wallpapers, produced between the 1960s and 80s. Reportedly, Warhol got the idea from art dealer Ivan Karp, who once suggested, ‘Why don’t you paint some cows? They’re so wonderfully pastoral and such a durable image in the history of the arts.’ When Karp saw what Warhol had produced, he exclaimed ‘They’re super-pastoral! They’re ridiculous! They’re blazingly bright and vulgar!’ For his next show, Warhol papered every wall in the gallery with them