Space
Space. The vastness of what we blithely call "the universe" should be a perpetual call to humility. To recognizing our location as a speck in all this immensity. The poet Rilke called it "Raum," and meant by this the capaciousness of life, the breathtaking boundlessness of "the real."
Remembering our size is a useful practice, one that has the capacity to make us more mindful of the sheer gift of life. Remembering that we somehow "belong" in this theater of space is an unexpected call to gratitude, to realize that for this "moment" in cosmic time we have eyes to glimpse some small part of this, and hearts to locate ourselves graciously within this reality--which we hardly recognize from day to day, busy as we are with our lives and often enough driven by the presumption of our own significance.
And we are. Significant, that is. But probably in no way we generally see or acknowledge. What would it mean to practice seeing our "place" in this universe as something other than the center? As a life-form with no real power over any of this, except for the capacity to live in the tidal flow of love? An alpine lake, sheltered from the wind, can mirror the night sky with an attentiveness that comes from simple laws of physics--light reflecting upon its glassy surfaces. What of us?