At one time, what is now referred to as the Shrine Room (or sometimes Candle Room) was the location of the Baptismal font, in keeping with an older tradition that the Baptistery be kept separate from the Sanctuary. Hence, the Baptismal imagery in the windows.

Baptismal Shell

As used during the Sacrament of Baptism.

The Baptism of Jesus by John

Matthew 3:13-17

Then Jesus came from Galilee to John at the Jordan to be baptized by him. John tried to prevent him, saying, “I need to be baptized by you, and yet you are coming to me?” Jesus said to him in reply, “Allow it now, for thus it is fitting for us to fulfill all righteousness.” Then he allowed him. After Jesus was baptized, he came up from the water and behold, the heavens were opened [for him], and he saw the Spirit of God descending like a dove [and] coming upon him. And a voice came from the heavens, saying, “This is my beloved Son, with whom I am well pleased.”