Zechariah and Micah look down on the fulfillment of their prophecies contained in the banderoles floating behind them. The Erythraean Sibyl is shown observing, while the Cumaean Sibyl, wearing a green dress with thick fur sleeves, gazes down at Mary, her hand held in empathy over her own womb. Micah's lunettes are an early instance of an illusionistic motif, wherein the sense of the boundary between the painting, frame and viewer's space becomes blurred. In this example, the prophet knowingly places his hand outwards on the lower border of the frame.