The panels are organised in two vertical registers, each with double sets of foldable wings containing inner and outer panel paintings. The upper register of the inner panels represent the heavenly redemption, and include the central Deësis of Christ the King (or perhaps God the Father), the Virgin Mary and John the Baptist. They are flanked in the next panels by angels playing music and, on the far outermost panels, the figures of Adam and Eve. The central panel of the lower register shows a gathering of saints, sinners, clergy and soldiers attendant at an adoration of the Lamb of God. There are several groupings of figures, overseen by the dove of the Holy Spirit. The four lower panels of the closed altar are divided into two pairs; sculptural grisaille paintings of St John the Baptist and St John the Evangelist, and on the two outer panels, donor portraits of Joost Vijdt and his wife Lysbette Borluut; in the upper row are the archangel Gabriel and the Annunciation, and at the very top are the prophets and sibyls. The altarpiece is one of the most renowned and important artworks in European history.