Sycamore's image contains visual references to Mary Queen of Heaven, Notre Dame's golden dome and her grotto.

A great sign appeared in heaven: a woman clothed with the sun, and the moon under her feet, and on her head a crown of twelve stars; and she was with child; and she cried out, being in labor and in pain to give birth. 

Revelation 12:1-2

The golden arch between the blue and gray represents the golden dome and the sun clothing Mary. Whether it also represents the sun setting on our beloved University or the sun rising over her depends on the success of Sycamore and others working to preserve Notre Dame's Catholic identity.