Pier Paolo Pasolini at The Paris Review:
Anything I could ever know about Caravaggio derives from what Roberto Longhi had to say about him. Yes, Caravaggio was a great inventor, and thus a great realist. But what did Caravaggio invent? In answering this rhetorical question, I cannot help but stick to Longhi’s example. First, Caravaggio invented a new world that, to invoke the language of cinematography, one might call profilmic. By this I mean everything that appears in front of the camera. Caravaggio invented an entire world to place in front of his studio’s easel: new kinds of people (in both a social and characterological sense), new kinds of objects, and new kinds of landscapes. Second: Caravaggio invented a new kind of light. He replaced the universal, platonic light of the Renaissance with a quotidian and dramatic one. Caravaggio invented both this new kind of light and new kinds of people and things because he had seen them in reality. He realized that there were individuals around him who had never appeared in the great altarpieces and frescoes, individuals who had been marginalized by the cultural ideology of the previous two centuries. And there were hours of the day—transient, yet unequivocal in their lighting—which had never been reproduced, and which were pushed so far from habit and use that they had become scandalous, and therefore repressed. So repressed, in fact, that painters (and people in general) probably didn’t see them at all until Caravaggio.
more here.