Replying to Insight wanted: Photography as a form of communication vs. pure art

Fellow photographers of newschoolers, I have a question for you (and this is meant to be very open ended). At what point does a photograph go from being a form of communication, to purely a work of art? For (a very basic) example someone might photograph a flower to document it for an encyclopedia, while another person might shoot it because of its color in a particar light, with little regard for what type of flower it is or whether it can be recognized as such. Where the point of one is to display a fact, the other is to convey an idea or emotion. Do all photos have elements of both or can you have examples where its 100% one or the other. I think this is particularly interesting in regards to skiing because so many photos are taken to show an event or document an accomplishment, but are also in themselves works of art. Discuss.