Study for The Five Factories  1987

Study for The Bus Stop  2009

Study for the Yellow Truck 

Study for Waiting for the Train  1969

Study for the Reservoir, Centennial Park  1989

First Study for the President Factory  2002

First Study for The Arrow Carriers  1978

Final Study for the Rome Metro 

First Study for on the Wharf, Livorno  2001

Study for New York (View from the Artist’s Window)  2004

Study for the Island  1961