The Pantocrator figure first became half-length because large versions filled the semi-dome of the apse of many, if not most, decorated churches. A full-length figure would need to be greatly reduced for the head to make maximum impact from a distance (because of the flattening at the top of the semi-dome). The gesture Christ makes has become one of blessing, but is originally an orators gesture of his right to speak.Christ in early examples is Christ the Teacher: the gesture of Christ's right hand is not the gesture of blessing, but the orator's gesture; the identical gesture is to be seen in a panel from an ivory diptych of an enthroned vice-prefect (vicarius), a Rufius Probianus, ca 400, of which Peter Brown remarks, "With his hand he makes the 'orator's gesture' which indicates that he is speaking, or that he has the right to speak." Staatsbibliothek Berlin. Illustrated in Peter Brown, "Church and leadership" in Paul Veyne, editor, A History of Private Life: From Pagan Rome to Byzantium 1987, p 272. The Deesis became standard at the centre of the templon beam in Orthodox churches and the templon's successor, the iconostasis, and is also found as a panel icon. Generally the Pantocrator has no visible throne, but the earlier Deesis does, and at least a single-step dais. The Deesis continues to appear in Western art, but not as often or in such an invariable composition as in the East.
