Andree Hayum approaches Matthias Gruenewald's Isenheim Altarpiece, now at the Musee d'Unterlinden in Colmar, as a structural and iconographic entity and restores it to its broader cultural context in the early 16th century. She interprets the altarpiece in terms of its hospital context, then explores how this polyptych functions as a system of communication, in relation to contemporary sermons and in response to an emerging print culture. The meaning and motivation behind the direct visual appeal of the Isenheim panels are considered within the liturgy and the sacramental economy.