John Berger. The art of seeing (№ 396438)

Camera isolated momentary images and thus destroyed the idea of their timeless nature. Or, in other words, the camera showed that the idea of time passing was inseparable from the visual experience (this applies to everything except painting). What you see depends on where you were and when. What you saw was derived from your position in time and space. It became impossible to continue to assume that everything converges on the eye as the vanishing point of infinity.
I don't want to say that before the invention of the camera men believed that everyone sees everything. But the prospect of organized visual space as if it actually was the ideal. Every drawing or painting using perspective, tells his audience that he is the center of the world. However, the camera - especially the camera - shows that center there.
The invention of the camera changed the way of seeing the world. Visible has come to mean for us something different. This instantly had an effect on painting.
For the Impressionists the visible world is another, he does not wait, when people will consider it. On the contrary, the visible becomes fluid and fleeting. For the Cubists the visible - it is not something that may catch one's eye, but a whole host of possible views on the subject or the represented person.