lay figure vs rube

lay figure

noun
  • An unimportant person; a character (especially in fiction) lacking individuality. 

  • A jointed model of the human body used by artists, or to display clothes. 

rube

noun
  • An uninformed, unsophisticated, or unintelligent person. 

  • A person of rural heritage; a yokel. 

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