Study for Waiting for the Train  1969

Study for The Discussion  1969

First Study for the President Factory  2002

Study I for a Mural  1969

Study for The Bus Stop  2009

First Study for The Arrow Carriers  1978

Study for The Five Factories  1987

Study for the Yellow Truck 

Study for Waiting Woman, Naples  1970

Study for the Reservoir, Centennial Park  1989

Final Study for the Rome Metro