The complex nature of identity is the subject of the work of the American artist Roni Horn. This volume comprises a series of photographic portraits presented in a public space as part of a project designed for the Schirn Gallery, Frankfurt. The work of Roni Horn, born in 1955, was on view in 2009 in a major retrospective at museums including Tate Modern London and the Whitney Museum of American Art in New York. She explores the subject of changing identities using a wide variety of media, including photography, sculpture, installation, drawing and text. The artist plays with similarities and differences in photographic portraits in particular, sounding out the ambiguity of various human facial expressions. The face becomes a projection screen for an internal dialogue for the viewer. With an introduction by Max Hollein and an essay by Kristin Schrader.