I go with your first choice, the capture the art and pure beauty of nature. Then I also wish to record what a plant looks like in bloom in my database of orchids. To me its still a bit of a miracle that I can get such exotic plants to bloom at all and the moment needs to be captured and saved, In the long run it doesn't matter much as we will all die and someone will erase the flowers of our past but in the meantime we can be proud of having raised them from whatever status we purchased these plants.