The camera pans across from the glasses in Rei’s hand to the two of them together on the floor.
Dr. Nick: Notice the rainbow. I bet that's symbolic, too.
Additional Commentary
Kendrix: Well, the rainbow is in the story of Noah, a symbol of a promise/bond between god and humanity. This is the beginning of a bond between a human and a divine being that will eventually influence the fate of humanity.
thewayneiac: Aren't you probably overthinking the religious symbolism there?