Diptych triptych form, with two outer panels that could be closed across the main central representation. They are one type of the multi-panel forms of painting known as "polyptychs". The diptych was a common format in Early Netherlandish painting and depicted subjects ranging from secular portraiture to religious personages and stories. Often a portrait and a Madonna and Child had a leaf each. It was especially popular in the 15th and 16th centuries. Painters such as Jan van Eyck, Rogier van der Weyden, Hans Memling and Hugo van der Goes used the form. Some modern artists have used the term in
Early Netherlandish painting time. That hinged works could be opened and closed served a practical purpose; on religious holidays the more prosaic and everyday outer panels were replaced by the lush interior panels. The "Ghent Altarpiece", completed in 1432, had different configurations for weekdays, Sundays and church holidays. The first generation of Netherlandish masters borrowed many customs from 13th- and 14th-century Italian altarpieces. The conventions for Italian triptychs before 1400 were quite rigid. In central panels the mid-ground was populated by members of the Holy Family; early works, especially from the Sienese or Florentine traditions, were overwhelmingly characterised by images of the enthroned