Lyric discussion by anjipeace 

Cover art for Underneath the Sycamore lyrics by Death Cab for Cutie

The song is about 2 people recognizing themselves within each other and their differences.

And for once in life everything is simple..."we are the same. we are both saved"

And I agree with the last comment.

As for the "lying in a field of glass, underneath the overpass"

somehow I find this to be metaphoric. But very vivid...you could imagine so many different scenarios here.