Campbell's soup cans are strewn across Andy Warhol's grave in Pittsburgh.

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Warhol was a leading exponent of the pop art movement that flourished in the 1960s, with images of Marilyn Monroe, Elizabeth Taylor and Campbell's soup cans among his most famous works.

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Indeed Rockwell out-Popped Warhol when he leant his name to a correspondence course called the Famous Artists School an easy-going coup for which Warhol would surely have given one of his Campbell's soup cans.

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