The Werl AltarpieceA picture or sculpture that stands on or is set up behind an altar. The term reredos is used for an ornamental screen or partition, not directly attached to the altar table but affixed to the wall behind it. A diptych is an altarpiece consisting of two panels, a triptych one of three panels, and a polyptych one of four or more panels. From the 14th to 16th century, the altarpiece was one of the most important commissions in European art; it was through the altarpiece that some of the most decisive developments in painting and sculpture came about. was a triptychA painting in three sections, usually an altarpiece, consisting of a central panel and two outer panels, or wings. In many medieval triptychs the two outer wings were hinged so that could be closed over the center panel. Early triptychs were often portable. the central panelTerm in painting for a support of wood, metal, or other rigid substance, as distinct from canvas. Until the adoption of canvas in the 15th century nearly all the movable paintings of Europe were executed on wood, and even up to the beginning of the 17th century it is probable that as much painting was done on the one support as on the other. Painters who worked on a small scale often used copper panels (Elsheimer is a leading example), and in the colonial art of South America copper and tin and even lead and zinc were used. On a larger scale, slate has occasionally been used as a support, notably by Rubens for his altarpiece for Sta Maria in Vallicella (the Chiesa Nuova) in Rome; the picture he originally painted was said to reflect the light unpleasantly and slate was used for the replacement to produce a more matt finish. For wood panels the Italian masters of the Renaissance preferred white poplar, while oak was the most common wood used in northern Europe. Many other types were used, however; analysis of the contents of art galleries has yielded a long list, including beech, cedar, chestnut, fir, larch, linden, mahogany, olive, and walnut. In the 20th century cedar, teak, and dark walnut are favourites, and modern painters have also used plywood, fibre-board, and other synthetic materials as supports. of which has been lost. The left wing depicts the donator Heinrich von Werl, a theologian from Cologne, head of the Minorite Order, with St John the Baptist, the right wing St Barbara.
Though long regarded as an authentic work by Robert Campin (the Master of Flémalle), the altarpiece now is usually thought to be a pasticheA work of art using a borrowed style and usually made up of borrowed elements, but not necessarily a direct copy. A pastiche often verges on conscious or unconscious caricature, through its exaggeration of what seems most typical in the original model. by a follower. The bench on which St Barbara sits and the perspectiveThe method of representing three-dimensional objects on a flat surface. Perspective gives a picture a sense of depth. The most important form of perspective in the Renaissance was linear perspective (first formulated by the architect Brunelleschi in the early 15th century), in which the real or suggested lines of objects converge on a vanishing point on the horizon, often in the middle of the composition (centralized perspective). The first artist to make a systematic use of linear perspective was Masaccio, and its principles were set out by the architect Alberti in a book published in 1436. The use of linear perspective had a profound effect on the development of Western art and remained unchallenged until the 20th century. of the whole room is taken over from Campin's Annunciationthe term for the event described in the Gospel according to St. Luke, when the Angel Gabriel brings the Virgin Mary the news that she is to bear her son, Jesus Christ. The Annunciation was among the most widespread pictorial subjects of European art during the Middle Ages and the Renaissance. (Metropolitan Museum of Art, New York); even the white towel and the ewer of water, symbolizing the Virgin's chastity, have been copied, though they are not the attributes of St Barbara. Her attributeA symbolic object which is conventionally used to identify a particular person, usually a saint. In the case of martyrs, it is usually the nature of their martyrdom., the tower in which she was imprisoned, is shown outside the window - typical of the way the early Netherlandish school rationalized abstract symbols naturalistically. In the left wing, the mirror on the wall is borrowed from Jan van Eyck's Arnolfini Marriage in the National Galleryan upper story, similar to a tribune, running along the side of a building and open on one side to the interior; in a church (basilica) above the side aisles, over the ambulatory (central-plan building) and also over the west end. The gallery was used to keep certain groups of worshippers apart (women, noblemen). in London, painted four years earlier.