The Dove
The dove is often the symbol for the Spirit of God, and is shown here "... descending, like a dove, and coming to rest on him." while a voice [God's] proclaimed, "This is my Son ..."
The dove is also shown in the Nativity window and the Resurrection window, other important events in the story of Jesus.
The Birds of the Air
Apart from the dove symbolizing the Holy Spirit, Jesus uses the "birds of the air" as examples of God's providence or as examples of items of very little value. In this window there are birds in every panel.
The Lilies of the Field
Various references to flowers in the Bible are symbolic as well as literal. In Jesus' teaching in Matthew he refers to the "lilies of the field" as plants which do nothing useful, yet are beautiful to behold. Followers are admonished to be like the lilies and not to worry about what they are to wear.
The Lamp
"I am the light of the world," Jesus declared [John 8:12], and if the lamp is a symbol of Jesus, in this window we can see clearly how he does light all the world.
The Book
Below the lamp and above Jesus' head, is the outline of the uppper half of a book. All that we know about Jesus we have from a book, specifically the gospels. The stories of Jesus emerge from the pages of the Bible. But just as the lamp is higher than the book in this window, so Jesus is greater than the Bible, and the faith of Christians is to be fixed firmly in a person, not a book.