Angels are evidence that God is taking notice of us. They ask the same always: surrender, obedience, submission, and humility before the Holy One. Some say they make us homesick for heaven.
The surfaces of the world are aesthetically uneven. You come around a bend in the road and the world suddenly falls open. When we come upon beautiful things... they act like small tears in the surface of the world that pull us through to some vaster space.