In early Christian iconography, the dove of the Holy Ghost is often shown with an emanation of seven rays, as is the image of the Madonna, often in conjunction with a dove or doves. The Monastery of St. Catherine on Mount Sinai, circa 565 CE, shows the Transfiguration of Christ in the apse mosaic, with "seven rays of light shining from the luminous body of Christ over the apostles Peter, James and John." In the present day Byzantine-style St. Louis Cathedral in Missouri, the center of the sanctuary has an engraved circle with many symbols of the Holy Trinity. The inscription reads: "Radiating from this symbol are seven rays of light representing the seven gifts of the Holy Ghost." The Annunciation is an oil painting by Early Netherlandish master Jan van Eyck, from around 1434 – 1436. The picture depicts the Annunciation by the Archangel Gabriel to the Virgin Mary that she will bear the Son of God (Luke 1:26-38). In a prominent element of the complex iconographic work, the Seven gifts of the Holy Spirit descend to her on seven rays of light from the upper window to the left, with the dove symbolising the Holy Spirit following the same path. The seven rays on which the doves descend are unique elements in the painting in that they are of the heavenly realm rather than the earthly realm, with the difference shown by the artist through the use of gold leaf rather than ordinary oil paint. Only the seven rays are so treated, and  while all of the other light sources in the painting cast shadows , the seven rays do not.Gifford, E. Melanie, The Art Bulletin, March 1999:Van Eyck's Washington 'Annunciation': technical evidence for iconographic development. Page references are to online version. online text
In early Christian iconography, the dove of the Holy Ghost is often shown with an emanation of seven rays, as is the image of the Madonna, often in conjunction with a dove or doves. The Monastery of St. Catherine on Mount Sinai, circa 565 CE, shows the Transfiguration of Christ in the apse mosaic, with "seven rays of light shining from the luminous body of Christ over the apostles Peter, James and John." In the present-day Byzantine-style St. Louis Cathedral in Missouri, the center of the sanctuary has an engraved circle with many symbols of the Holy Trinity. The inscription reads: "Radiating from this symbol are seven rays of light representing the seven gifts of the Holy Ghost." The Annunciation is an oil painting by Early Netherlandish master Jan van Eyck, from around 1434 to 1436. The picture depicts the Annunciation by the Archangel Gabriel to the Virgin Mary that she will bear the Son of God (Luke 1:26-38). In a prominent element of the complex iconographic work, the Seven gifts of the Holy Spirit descend to her on seven rays of light from the upper window to the left, with the dove symbolising the Holy Spirit following the same path. The seven rays on which the doves descend are unique elements in the painting in that they are of the heavenly realm rather than the earthly realm, with the difference shown by the artist through the use of gold leaf rather than ordinary oil paint. Only the seven rays are so treated, and — while all of the other light sources in the painting cast shadows — the seven rays do not.Gifford, E. Melanie, The Art Bulletin, March 1999:Van Eyck's Washington 'Annunciation': technical evidence for iconographic development. Page references are to online version. online text
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