motion picture vs seventh art

motion picture

noun
  • A movie. 

  • A sequence of images depicting people or objects in motion, preserved on a recording medium and capable of being projected for viewing. 

name
  • a sequence of images that cause the illusion of motion 

seventh art

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

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