act out vs build castles in the air

act out

verb
  • To express ideas or desires through actions rather than words. 

  • Used other than figuratively or idiomatically: see act, out. 

  • To perform a scene from a play, a charade or an exercise. 

  • To perform a fantasy in reality. 

  • To perform something specific. 

  • To express one's feelings through disruptive actions. 

build castles in the air

verb
  • To have any desire, idea, or plan that is unlikely to be realized; to imagine visionary projects or schemes; to have an idle fancy or a pipe dream; to daydream. 

How often have the words act out and build castles in the air occurred in a corpus of books? (source: Google Ngram Viewer )