To speak technically photography is the art of writing with light. But if I want to think about it more philosophically, I can say that photography is the art of writing with time. When you capture an image you capture not only a piece of space, you also capture a piece of time. So you have this piece of specific time in your square or rectangle. In that sense I find that photography has more to do with time than with light. ,

"P.S.! I joined flickr since September 2009 but I changed my account ,don't ask me why T^T