Generally speaking, I'm not one to adovcate photographic rules, but I do think it helps to off the lens cap.
Knowing a great deal about what is in the world (art, catastrophe, the beauties of nature) through photographic images, people are frequently disappointed, surprised, unmoved when the see the real thing. For photographic images tend to subtract feeling from something we experience at first hand and the feelings they do arouse are, largely, not those we have in real life. Often something disturbs us more in photographed form than it does when we actually experience it.
The photographer was thought to be an acute but non-interfering observer – a scribe, not a poet. But as people quickly discovered that nobody takes the same picture of the same thing, the supposition that cameras furnish an impersonal, objective image yielded to the fact that photographs are evidence not only of what’s there but of what an individual sees, not just a record but an evaluation of the world. It became clear that there was not just a simple activity called seeing (recorded by, aided by cameras) but ‘photographic seeing’, which was both a new way for people to see and a new activity for them to perform.