Time
I’m fascinated when I can see time.
Katie and I were out for a short hike the other day along the Gallatin River south of Bozeman, where we saw these rocks covered in ice and a recent snowfall. My eyes tell me these rocks are strong, that they stand against the current for years and years and years, forcing the water to move around them.
But my brain knows that in the end, the water will win. It will turn these rocks into sand, which will then descend into the bowels of the earth, become compacted and reform as a new rock. That just kills me.
Thomas Lee True West 
Wow, Thomas. You photos make it look so immovable and sublime, but the forces that work on us all are humbling in the end.