Since 1949, the year of the trip to Antibes, Cassinari combines his love for the native countryside with that for the French coast. He meets Pablo Picasso, Georges Braque, Marc Chagall, Paul Eluard, Jean Cocteau in Antibes, where he moves and, in 1949, opens a studio, already mentioned in 1953 in Lionello Venturi's Commentaries. In the 1960s he develops an intimate and personal, almost poetic realism, represented through new themes, including "figures" and "still lifes" are often present.
Cassinari obtains enormous success with the public and critics, so much so that he lives his life and travels to exhibit his works in countless Italian cities, museums and galleries (Venice, Piacenza, Florence, Milan, Rome, Palermo, Turin, Brescia) and foreign (Paris, Lausanne, New York, London, Munich, Berlin, Caracas, Buenos Aires); he will be the protagonist of the major contemporary art exhibitions (Venice Biennale 1952, Rome Quadriennale) and awarded with countless prizes. In 1962 he returned to Gropparello (PC), his native land, and opened the studio with Ernesto Treccani. From that moment on, the rural environment already investigated in the 40s has reappeared in his work, now moved and lit up in a dramatic sense.