50. 50AR YVARAL (JEAN-PIERRE VASARELY) (1934-2002) Quadrature Diamant Vert 1972 signed; signed, titled, dated 1972 and numbered 1222 on the reverse acrylic on panel 80.5 x 80.3 cm. The authenticity of this work has been confirmed by Pierre Vasarely, the only son of Jean-Pierre Vasarely, known as Yvaral, and a member of the French Union of Experts. Provenance Galerie Denise René, Paris Sale at Piasa, Paris, Contemporary Art, Urban Art, 12 December 2011, lot 83 Acquired at this sale by the current owner