I go and get the camera and do it. Photography is a medium in which if you don’t do it then, very often you don’t do it at all, because it doesn’t happen twice. A rock will probably always be more or less there just the way you saw it yesterday. But other things change, they’re not always there the day after or the week after. Either you do it or you don’t. Certainly with things as changeable as sky and landscape with moving clouds and so on, if they look wonderful to you on a certain day and if you don’t do it then, you may never see them again for the rest of your life. So as a photographer you become very conscious – at least I do – that everything is in movement. – Paul Strand