Jef Verheyen, Diagon A/B B/C, 1974, mat lacquer on canvas, 95.2 x 95.2 cm, 37 1/2 x 37 1/2 ins. Photo: Robert Glowacki. © Jef Verheyen. Courtesy Axel Vervoordt Gallery, Belgium & Stuart Shave/Modern Art, London

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