Lyric discussion by erie_bound 

Cover art for Sea of Air lyrics by Portugal. The Man

"We've got the whole world just hanging out, we've got no seed of doubt."

When the speaker and his people heard about the sea of air and went looking for some sort of landmark (a tower so tall....), "nothing" was there. And that's okay--in fact, that's great. A lot of the structures that others insist are important (religion in particular, but really any attempt to impose too much order on the world) simply aren't important. In fact, they're a distraction from just enjoying life. Go argue with God about the bad things if you must, trying to make sense of it all.....or just embrace the "part of you that never cared" about all of that, and just hang out enjoying it with us, in our little sea of air.

Even without making sense of it all, when the speaker faces the void, he will be brave -- because this is a place where you're "just hanging out," appreciating the beauty of the supposedly empty chaos of life. There's no activity; the whole world isn't stressfully twisting around you -- it's just "hanging there," without a strong need to have structure imposed. Just relax and appreciate it.

My Interpretation

@erie_bound thanks !