by Binh Danh
He uses a similar process to a cyanotype, in that it's a "contact negative" process: the negative is the same size as the resulting photo.
He later preserves these unique photos in resin, after photosynthesis has done its work.
The first time I saw his work I was reminded of many reportage exhibitions I'd seen in Cambodia. Some of his images are from the Khmer Rouge period and its aftermath.