Artists Claes Oldenburg and Coosje van Bruggen's whimsical "Plantoir" trowel sculpture in Iowa capital city of Des Moines was specifically designed for outdoor viewing in a garden setting | Library of Congress
Coosje van Bruggen - Wikipedia
Claes Oldenburg & Coosje van Bruggen | Pace Gallery
Claes Oldenburg and Coosje van Bruggen's 'Screwarch': The Pop Art Bridge That Never Was
Claes Oldenburg & Coosje Can Bruggen. Public Sculpture, Architecture and Urbanism - Espace art actuel