When the wings of the Van Eycks' altar-piece of the 'Adoration of the Lamb' were opened on festivals, the subjects of the upper central picture were seen, consisting of the Triune God, a majestic figure, and at his side in stately calm the Virgin and the Baptist. On the inside of the wings were angels, at the two extremities Adam and Eve. The lower central picture shows the Lamb of the Revelation, whose blood flows into a cup; over it is the dove of the Holy Spirit. Angels, who hold the instruments of the Passion, worship the Lamb. Four groups of many persons advance from the sides, these are the holy martyrs, men and women, priests and laymen. In the foreground is the fountain of life; in the distance are the towers of the heavenly Jerusalem. On the wings other groups are coming up to adore the Lamb; on the left those who have laboured for the Kingdom of the Lord by worldly deeds--the soldiers of Christ led by St George, St Sebastian, and St Michael, the patron saints of the old Flemish guilds, followed by emperors and kings--a goodly company. Beyond the soldiers and princes, on the left, are the righteous judges, also on horseback. In front of them, on a splendidly caparisoned gray, rides a mild, benevolent old man in blue velvet trimmed with fur. This is the likeness of Hubert Van Eyck, painted after his death by his brother John, and John himself is in the group, clothed in black, with a shrewd, sharp countenance. On the self-renunciation have served the Lamb in the spirit, hermits and pilgrims, among them St Christopher, St Anthony, St Paul the hermit, Mary Magdalene, and St Mary of Egypt. A compartment underneath, which represented hell, finished the whole--yet only the whole on one side, for the wings when closed presented another series of finely thought-out and finished pictures--the Annunciation; figures of Micah and Zechariah; statues of the two St Johns, with the likenesses of the donors who gave to the world so great a work of art, kneeling humbly side by side, the burgomaster somewhat mean-looking in such company in spite of the proof of his liberality, but his wife noble enough in feature and expression to have been the originator of this glory of early Flemish painting. The upper part of the picture is painted on a gold ground, round the central figure of the Lamb is vivid green grass with masses of trees and flowers--indeed there is much lovely landscape no longer indicated by a rock or a bush, but betokening close observation of nature, whether in a fruitful valley, or a rocky defile, or mountain ridges with fleecy clouds overhead. The expression of the immense number of figures is as varied and characteristic as their grouping.[2]