reality vs unreality

reality

noun
  • The entirety of all that is real. 

  • The real world. 

  • The state of being actual or real; realness. 

  • An individual observer's own subjective perception of that which is real. 

  • A real entity, event, or other fact. 

unreality

noun
  • That which has no reality or real existence; something unreal or imaginary 

  • The state of being unreal 

  • Unpractical character; visionariness. 

  • Lack of reality or real existence. 

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