The distinction between subject and object is a basic idea of philosophy.

• A subject is a being that exercises agency, undergoes conscious experiences, is situated in relation to other things that exist outside itself; thus, a subject is any individual, person, or observer.
• An object is any of the things observed or experienced by a subject, which may even include other beings (thus, from their own points of view: other subjects)

A simple common differentiation for subject and object is: an observer versus a thing that is observed. In certain cases involving personhood, subjects and objects can be considered interchangeable where each label is applied only from one or the other point of view. Subjects and objects are related to the philosophical distinction between subjectivity and objectivity: the existence of knowledge, ideas, or information either dependent upon a subject (subjectivity) or independent from any subject (objectivity).

• Simple difference
  • observer ( subject )
  • thing that is observed ( object )
• difference in the existence of knowledge, ideas, or information. ( difference in existence )
  • subjectivity ( dependent upon a subject (subjectivity) )
  • objectivity ( independent from any subject (objectivity). )

• Abstract object
• Abstract Nouns
• Abstract beings
  • Soul
• Art
• Fregean senses
• Mental representations or mental objects or mental substance
  • Cognition
  • Mind
• Spiritual