We worked for this one. A large format film image of an almost frozen river surrounded by snow in the Chugach Mountain rainforest of Alaska captured on Kodak Ektachrome E100 Color Reversal Slide Film using a 4X5 Linhof Technikardan made in West Germany in the 1980s and an 80-year-old Schneider-Kreuznach 90mm lens and a cold minus 15ºF (-17ºC) day after snowshoeing into the woods (which my doggo/creative director was not at all happy about). Self-developed using a slide reversal kit from CineStill film.