Comfortably seated before a large photograph of Sitting Bull in the Peabody's Wiyohpiyata: Lakota Images of the Contested West exhibition, the group's discussion is lively. "Is this the kind of person you'd like to meet?" asks a tour leader. "Yes! I want to hear his story. He looks like he went through a lot of things. Weathered, he looks weathered." "That's a good word," encourages leader Sally Sutton. She's an Endicott College senior, interning full-time with ARTZ: Artists for Alzheimer's.