1. undertake a parallel journey, matching the physical steps of a pilgrimage with the metaphysical steps of a questioning
e.g. in Peter Matthiessen’s great “The Snow Leopard”.
2. chronicle a trip to the farthest reaches of human strangeness
e.g. Oliver Sacks’ “Island of the Color-Blind,” which features a journey not just to a remote atoll in the Pacific, but to a realm where people actually see light differently).
