In Part 9 of Engineering the Inka Empire: A Symposium on Sustainability and Ancient Technologies, Colin McEwan provides some closing remarks.Colin McEwan is Director of Pre-Columbian Studies at Dumbarton Oaks Research Library and Collection, Washington, DC. Dr. McEwan specializes in the art and archaeology of the pre-Columbian Americas and has carried out fieldwork in diverse settings ranging from the Peruvian Highlands, Upper Amazon, coastal Ecuador, and Patagonia. From 1979--1991, he directed the Agua Blanca Archaeological Project focused on a major Manteño settlement in the Machalilla National Park, coastal Ecuador. He was formerly Head of the Americas Section at the British Museum, London, where he authored or co-edited numerous exhibition publications, including Pre-Columbian Gold: Technology, Style and Iconography (2000), Unknown Amazon: Culture in Nature in Ancient Brazil (2001), Turquoise Mosaics from Mexico (2006), El Caribe Pre-Colombino (2008); Ancient American Art in Detail (2009) and Moctezuma: Aztec Ruler (2009). He is particularly interested in reconstructing and interpreting the roles that objects play in prehistoric cultural landscapes.This symposium was webcast on November 14, 2013 from the Rasmuson Theater at the National Museum of the American Indian in Washington, D.C.