The complex human eye harvests light. It perceives seven to ten million colors through a synaptic flash: one-tenth of a second from retina to brain. Homo sapiens gangs up to 70 percent of its sense...

For bighorns, topography is memory, enhanced by acute vision. They can anticipate the land’s every contour–when to leap, where to climb, when to turn, which footholds will support their muscular bodies. To survive, this is...

Its beauty stirs the imagination, and I wonder if the last refuge of all that is truly wild lies not on earth but in light.