Robert Rauschenberg
      
            Eco-Echo VI
1992–93
      
            Silkscreen ink and acrylic on aluminum and Lexan with sonar-activated motor
88 x 73 x 26 inches (223.5 x 185.4 x 66 cm) 
      
            Made in collaboration with Saff Tech Arts, Oxford, Maryland
Collection of the Carl & Marilynn Thoma Foundation
RRF
              93.030
           
                