1 (A diptych, which is simply two panels hinged together, is a traditional European method of presenting two complementary scenes of painting or relief sculpture. Relief panels were often made to decorate altars, to serve as book covers, or in the form of a diptych. Such objects were also produced to a lesser extent in metal and wood. The primary types of medieval sculpture in Western Europe were architectural sculpture (especially reliefs) and carved ivory objects (aka "ivories"), including small figures, crucifixes, relief panels, and containers. With the fall of Rome, statues disappeared as a major art form in Europe until the Gothic age. Summary of Eastern Medieval Sculpture Dark Ages Ottonian (ivories, Bernward doors and column, Gero Crucifix)