We all dream, yet most of us have no problem distinguishing our dreams from our experiences when awake.  We all tell stories, but most of us believe there is a difference between fact and fiction.  As a consequence, we talk about dreams, fiction and our ordinary experience in different ways which are based on different assumptions about the relation of each to reality.  These assumptions can differ slightly from person to person and from culture to culture, and they are also subject to revision by artists of all kinds.  If they are not spelled out the result can be confusion and disorientation, either accidental or intended.

-Lee Smolin, Three Roads to Quantum Gravity


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