Who never thinks about grass?
Grass is everywhere and unless you're a hermit and never leave your house, you see it virtually constantly. Even vaguely, it's always on your mind. You can't help it. Walk outside, look in the backyard-- grass. Wake up and get out of bed, glance out the window-- grass. Drive to the grocery store and gaze about the town, look! the town field-- grass. Go for a run on the trail-- grass.

It's everywhere and inescapable. You can try but there is absolutely no way to avoid thinking about grass.

Good thing grass is nice stuff to think about. It's a consistency that never becomes annoying.