title_body: How could a conlang enforce subjective idealism in a constructed world Subjective idealism is the monistic metaphysical doctrine that only minds and mental contents exist. It entails and is generally identified or associated with immaterialism, the doctrine that material things do not exist. Subjective idealism rejects dualism, neutral monism, and materialism.
  
  How could my to be constructed language be restricted to such view of reality?
  
  My guess is that its semantic primes should consist of:
  
  
  qualia: individual instances of subjective, conscious experience such as  the redness of an evening sky, pain of a headache, the taste of wine, etc.
  A pronoun like *I* to refer to one's self
  Verbs such as *think*, *believe*, *know*
  Adverbs such as: *now*, *before*, *after*
  
  
  Objects (e.g. chair, table, etc.), other personal pronouns (you, he, etc.), matter and all the other things that do not really exist (in the view of subjective idealism) would be defined as paraphrases.
  
  Edit: Note that this is not a question on subjective idealism in reality, but about subjective idealism in a constructed world. Therefore arguments against subjective idealism in reality are irrelevant.
upvoted_answer: You may be interested in E-Prime.  
  
  E-Prime is a version of English that excludes all forms of the verb to be, including all conjugations, contractions and archaic forms. This makes many objective statements like "Roses are red" impossible. Instead a person is required to use more subjective constructions like "Roses appear red to me".