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
Annunciation (van Eyck, Madrid) Annunciation (van Eyck, Madrid) The Annunciation (sometimes Diptych of The Annunciation) is an oil on wood in grisaille painting by the Early Netherlandish artist Jan van Eyck, dated by art historians as between 1434 and 1436. The panels form a diptych, and are currently in the collection of the Museo Thyssen-Bornemisza, Madrid. The figures and iconography are very similar to those in the outer panels of van Eyck's earlier "Ghent Altarpiece" completed in 1432. However, their relative small scale suggests commission for private worship rather than public celebration. The panels show the Archangel Gabriel on the left and the Virgin