The Grand Canyon. 
Raft its water that ever changes.
Hike the the contours of one minuscule area.
Memorize the geologic terms. 
But
Never grasp the immensity: time, earth air and water. 
Always evolving, what might we embrace, hold inside of the wonder?
I chose one day in winter to watch the canyon change, not geologically, not hydrologically. From light.