The media are essentially contentless (this is the truth behind Marshall McLuhan’s celebrated remark about the message being the medium itself); their characteristic tone is ironic, or dead-pan, or parodistic. It is inevitable that more and more art will be designed to end as photographs. A modernist would have to rewrite Pater’s dictum that all art aspires to the condition of music. Now all art aspires to the condition of photography.

— Susan Sontag, On Photography, 1977