The health of the eye seems to demand a horizon. We are never tired, so long as we can see far enough. Ralph Waldo Emerson, Nature. This Emerson quote has always resonated with me. My family moved to Custer, South Dakota, in the southern Black Hills, when I was four. We drove southwest to Colorado and east to Sioux Falls and neighboring Minnesota too many times to count. The home I grew up in looked out over those same Black Hills. I first…