The two panels that compose the Frick painting, now framed together, probably originally formed the wings of a small altarpiece of which the central panel has been lost. Around the middle of the fifteenth century, the subject of the Annunciation had become exceedingly popular in the art of Florence. Fra Filippo, who often depicted the scene, usually placed the figures in elegant and complicated architectural settings, made festive with birds, flowering plants, and sunny landscapes seen in the distant background. The setting of the Frick Annunciation is instead bare and simple, painted in muted terracotta, violet, and gray, with nothing to distract the viewer from the gentle drama being enacted. The lily carried by the angel Gabriel symbolizes the Virgin’s purity, while the dove represents the angel's words to her: “The Holy Ghost shall come upon thee.”
Source: Art in The Frick Collection: Paintings, Sculpture, Decorative Arts, New York: Harry N. Abrams, 1996.