What purpose is a photograph?

Southwest from the South Jetty, Clatsop County, Oregon, 1990 A - Robert Adams
We take them or make them. Maybe it does not matter to try not to forget – a mark in time always, a promise perhaps – an insane attempt to address the inevitable next with optimism.
Three important and beautiful series of black-and-white landscape photographs will be showcased in Oceans, Rivers, and Skies: Ansel Adams, Robert Adams, and Alfred Stieglitz.