His monochromatic blue sponge painting sold for $4,720,000 .
Alongside works by Andy Warhol and Willem de Kooning , Klein 's painting RE 46 ( 1960 ) was among the top - five sellers at Christie 's Post-War and Contemporary Art sale in May 2006 .
Klein 's monochromatic blue sponge painting sold for $4,720,000 .
Alongside works by Andy Warhol and Willem de Kooning , Klein 's painting RE 46 ( 1960 ) was among the top - five sellers at Christie 's Post-War and Contemporary Art sale in May 2006 .