feast for the eyes vs ken

feast for the eyes

noun
  • Visually pleasing sight; something that is easy on the eye. 

ken

noun
  • Range of sight. 

  • Youth or children's group. 

  • A Japanese unit of length equal to six shakus 

  • Knowledge, perception, or sight. 

  • The tsurugi 

verb
  • To know, perceive or understand. 

How often have the words feast for the eyes and ken occurred in a corpus of books? (source: Google Ngram Viewer )