When I was learning basic political science in my youth I was taught that when political beliefs are sorted along an axis from conservative to liberal, the ends of the axis joined to form a circle. The most conservative systems are in effect indistinguishable from the most liberal ones, being plain old authoritarianism. (I'm not saying how to agree or not with this.)
Our experiences may be sorted along an axis from most personal to most universal, and my observarion is that this axis finds its extremes joined in a very similar way.