Once in a while, look up.
You'd think this would be a no-brainer, wouldn't you? But, if you're at all like me, it's like breathing. You take it for granted; you forget that, occasionally, it needs your attention. Haven't you ever concentrated so much on something—you know, that body-and-soul concentration where you shut out everything around you?—that you realized you'd been forgetting to breathe?
Well, it's the same thing with looking up. We get so focused on what's right in front of our noses, or what's going on inside our heads, we forget that, of the 360-degree reach of our vision, about half of it—with all its wonders of wisp and wing, billow and beam—lies above eye level.