Half Dome, Thunder Cloud, Yosemite National Park, California, c. 1956

Adams wrote the following in a letter to Cedric Wright on June 10, 1937:

'A strange thing happened to me today. I saw a big thundercloud move down over Half Dome, and it was so big and clear and brilliant that it made me see so many things that were drifting around inside of me; things that related to those who are loved and those who are real friends.'

(The above letter as published in: Andrea Stillman, Ansel Adams: Letters and Images 1916-1984, Little, Brown and Co., Boston, 1988, p. 95)