The window depicts the angel revealing to the shepherds the birth of the Messiah. "And there were shepherds living out in the fields nearby /.../An angel of the Lord appeared to them, and the glory of the Lord shone around them /.../ I bring you good news that will cause great joy for all the people. Today in the town of David a Savior has been born to you; he is the Messiah, the Lord." (Luke 2,8). At the bottom of the picture we can see the shepherds bathed in the light from the sky. They're looking toward the hills where an angel has just appear. At the side, there is a silhouette of St.Peter the apostle who's responding to Jesus in these words: ?You are the Messiah, the Son of the living God.? (Matthew 16, 16)