I hiked with Art in Patagonia when he shot the images in the Edge of the Earth, Corner of the Sky while I was researching my own new book, Classic Hikes of the World. Time and again, Art would rush to a spot and set up his camera. I looked where he was pointing but saw nothing unusual. When we returned to the US and I saw the pictures, I was shocked. Art has a unique ability to capture fleeting moments, or pick out the one element in a landscape that makes a strong composition infused with magical light. Each time I looked at the shots in this book, I'm glad I'm a writer.