Chelsea's poem starts as an argument with anyone who thinks the world is ugly. The speaker lists small, ordinary wonders that such a person must have missed: the night sky, the shift in the air just before rain, the view from an airplane window, the first moment of sunrise, lying back and looking up at the sky. Each one is something you only notice if you slow down and pay attention.
The turn comes in the last four lines. Even if someone has seen all of this and still finds the world ugly, the speaker suggests, the problem is that they can't see what the speaker sees in the person they love. Beauty is no longer only out in the world. It is in the person being addressed.
The mood is warm, gentle and quietly confident. The speaker isn't angry at pessimists; they sound more like someone who wants to share a better view. The simple, conversational language makes the love feel sincere rather than showy.