1. Photography enabled art. Because most (if not all) art (traditional painting, sculpting) was done by commission prior to the invention of photography, art as a means of self expression didn't exist. Artists were essentially extremely skilled illustrators who worked for a paycheck filling the void of creating portraits and landscapes because photography didn't exist. When photography came along, it made this function - and the artists/illustrators obsolete. Photos were faster, cheaper, and more accurate means of essentially documenting. Artists, such as Picasso, reinvented art as a means of self-expression and using the medium to re-envision the world and as a means of communication. Art, therefore, didn't exist prior to the advent of photography because it was not a means of communication/expression and artists were highly-skilled illustrators, in essence.