Double Ringed Roto, 1968, 60 1/2 x 136 inches, (shaped), Moulded Polyester Resin and Fiberglass,
Dodecagon Series, (PTG 0077)
Collection: The Anderson Collection at Stanford University, CA

Included in the one-man exhibition:
Dodecagonals, 1968
Kasmin Gallery, London
November 1, 1968