 However, all
    of these theories have reference to a common world, and they indicate
    under their varying lights more or less overlapping regions in the
    state space of the system, or in some derivative or extension of
    the basic state space.

MW: &quot;Reference to a common world&quot; is the question.  We would probably
    all agree that there is one &quot;common world&quot; that we all experience,
    but there is good evidence that we don't all experience it the
    same way, e.g. 3D/4D, th