breathing space vs caesura

breathing space

noun
  • A rest, pause, or respite. 

  • Enough distance so that one can feel unfettered. 

  • Sufficient space or a span of time in which to recover one's breath. 

caesura

noun
  • A pause or interruption in a poem, music, building, or other work of art. 

  • Using two words to divide a metrical foot. 

  • The caesura mark ‖ or ||. 

  • A break of an era or other measure of history and time; where one era ends and another begins; turning point. 

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