auditorium vs celluloid

auditorium

noun
  • the space where the audience is located 

  • a large room for public meetings or performances 

celluloid

noun
  • The genre of cinema; film. 

  • Any of a variety of thermoplastics created from nitrocellulose and camphor, once used as photographic film. 

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