piece of art vs technic

piece of art

noun
  • Synonym of work of art 

technic

noun
  • Technical terms or objects; things pertaining to the practice of an art or science. 

  • The doctrine of arts in general; those branches of learning that relate to the arts. 

  • The method of performance in any art; technique. 

adj
  • Technical 

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