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Lyubov Popova, Aleksandra Ekster and Rodchenko’s wife, Varvara Stepanova (1894–1958), all played a major part in defining, developing and creating Constructivist art. Popova offered an early definition of their practice, saying “construction in painting is the sum of the energy of its parts.
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Will Gompertz (What Are You Looking At?: The Surprising, Shocking, and Sometimes Strange Story of 150 Years of Modern Art)