photography vs seventh art

photography

noun
  • The occupation of taking (and often printing) photographs. 

  • The art and technology of producing images on photosensitive surfaces, and its digital counterpart. 

seventh art

noun
  • Chiefly preceded by the: the art of making motion pictures; filmmaking. 

How often have the words photography and seventh art occurred in a corpus of books? (source: Google Ngram Viewer )