Snow in the Grand Canyon. This tunnel book was created from photographs taken on the morning of March 22, 2011, after an overnight snowfall had dusted the tops of the rock formations and iced the foot trails down into the canyons. We were on the south rim, shivering and amazed, transfixed by the sheer immensity of the landscape, and intensely aware that this was just a nanosecond of geologic time.