Nancy J. Troy (Victoria and Roger Sant Professor in Art at Stanford University and former Edmond J. Safra Visiting Professor at the National Gallery of Art) discusses Piet Mondrian’s painting Tableau No. IV: Lozenge Composition with Red, Gray, Blue, Yellow, and Black (c. 1924/1925). Troy describes the history and previous iterations of this diamond composition and the work’s powerful influence within popular and artistic spheres.