The photographer chooses the tree, the view of it he/she wants, the kind of fim, the focus, the filter, the time exposure, the strength of the developing solution, the sort of paper to print on, the darkness or lightness of the print, the framing of the print - all this and more. But where he/she  does not intervene - and cannot intervene without changing the fundamental character of photography - is between the light, emanating from the tree as it passes through the lens, and the imprint it makes on the film.