build castles in the air vs calculate

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. 

calculate

verb
  • To plan; to expect; to think. 

  • To determine values or solutions by a mathematical process; reckon. 

  • To adjust for purpose; to adapt by forethought or calculation; to fit or prepare by the adaptation of means to an end. 

  • To ascertain or predict by mathematical or astrological computations the time, circumstances, or other conditions of; to forecast or compute the character or consequences of. 

  • To determine the value of something or the solution to something by a mathematical process. 

  • To imagine sequences of potential moves and responses without actually moving the pieces. 

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