Altarpiece unclear. Altarpieces can still broadly be divided into two types, the "reredos", which signifies a large and often complex wooden or stone altarpiece, and the "retable", an altarpiece with panels either painted or with reliefs. Retables are placed directly on the altar or on a surface behind it; a reredos typically rises from the floor. Retable-type altarpieces are often made up of two or more separate panels created using a technique known as panel painting. The panels can also display reliefs or sculpture in the round, either polychrome or un-painted. It is then called a diptych, triptych or polyptych for
Symmachi–Nicomachi diptych important events, most often the attainment of the consulship. The diptych form, at least originally, served as a pair of covers for wax writing tablets. The work as a whole has been interpreted as a study in nostalgia. Just as the majority of the Roman world had rejected polytheism in favor of Christianity, so too it left behind the techniques of proportion and perspective that characterised the art of its forebears. ---- Symmachi–Nicomachi diptych The Symmachi–Nicomachi diptych is a book-size, Late Antique ivory diptych dating to the late fourth or early fifth century, whose panels depict scenes of ritual pagan