Between the late 1950s through the mid-1960s Jasper Johns experimented with shaped and compartmentalized canvases, notably with his 'Three Flags' painting – one canvas placed on top of another, larger canvas. Robert Rauschenberg's experimental assemblages and "combines" of the 1950s also explored variations of divided and shaped canvas. Argentine artist Lucio Fontana also began early on the experiment in shaped and compartmentalized canvases with his Concetto Spaziale, Attese series in 1959. Assigning a date to the origin of the postwar shaped canvas painting may not be possible, but certainly it had emerged by the late 1950s.