In the 1940s Cavallon became increasingly interested in the properties of light. “The sequence of colored areas, though frequently blocked our as squares and rectangles, are part of a continuously expanding light" (Licht, Tre artisti italo-americani, 17). Twentieth-century art critic and poet Frank O'Hara writes that "there is that peculiar quality to... Cavallon’s work: it resembles a town in southern Italy the walls of which have absorbed the sunlight for centuries and even on a cloudy or raining day give off the intense light of what they have absorbed” (O'Hara, Art chronicles, 1954-1966, 103-104).