I shall also refer to these categories as ' concepts '. A typical example of a concept is what you think of when you are thinking of a chair . Even though you cannot define a chair, you recognize one when you see it. An example of a more abstract concept is furniture . Criticize the article from the Objectivist point of view.
Concepts are unnecessary constructs of a suspicious mental nature.
It is better to avoid concepts and talk about language only. I mean what I say. Words in themselves are empty. He lit a cigarette and admired her naked body which was illuminated by silver moonlight. It is clear that different people perceive different sense-data.