All true.  That doesn&#x27;t change the fact that <i>some</i> (in fact, much) subjective experience arises from external stimulus, and so it is not correct to say that <i>everything</i> you experience is <i>all</i> in your head.  <i>Some</i> of what you experience is all in your head (dreams, psychosomatic conditions, hallucinations), and the rest is a combination of in your head and not in your head.  (Obviously, any phenomenon that is <i>entirely</i> outside of your head is not part of your experience.)