Jean Pierre VASARELY known as YVARAL (1932-2002). "Numerical analysis of the Concorde". Oil on canvas signed at the bottom center, countersigned, titled and dated 1981 on the back. Height : 130 cm 130 cm - Width : 130 cm Jean-Pierre Vasarely chose the pseudonym Yvaral to distinguish himself from his father's work. Like his father, he plays with mathematical processes to create optical images that suggest movement and disturb vision. He pushed his research and founded the G.R.A.V. (Research Group for Visual Art) in 1961. With Horacio Garcia-Rossi, François Morellet, Julio Le Parc and Francisco Sobrino, he wished to desacralize creation and militated to "transform the current situation of plastic art". While pursuing industrial creations, Yvaral produced thematic series in the 1970s such as Les Progressions, Les Cristallisations, Les Structures ambiguës and, a little later, Les paysages numériques, from which our work is derived.