Suppose a photographer (like maybe HCB) was able to make a photograph with an evocative geometric arrangement of human forms doing everyday human stuff. That would be interesting. Suppose further the photographer was able to choose the moment so precisely as to capture especially evocative gestures and looks from said human forms. That would be (IMHO) impressive. Suppose further the photographer was able to do this over and over. That would be really impressive. Now suppose a whole bunch of humans decided independently of each other that this photographer's body of work really captured the feel of a particular era or people or whatever. Now that! Well that might get dangerously close to being Art. And for the record, I definitely think an Artist could produce a painting of Elvis on velvet that could qualify for the big "A".