Roni Horn (1955), whose work was featured in major retrospectives in 2009 at the Tate Modern in London and the Whitney Museum of American Art in New York, explores the theme of changing identity. She employs a variety of media, including photography, sculpture, installation, drawing, and text. The artist plays with similarities and differences, particularly in photographic portraits, while examining the ambiguity of human expression across different facial expressions. The face becomes a projection surface for an internal dialogue for the viewer.