the X that can be Y is not the true X

   Yet  another  instance of hackerdom's peculiar attraction to mystical
   references  --  a  common humorous way of making exclusive statements
   about  a class of things. The template is from the Tao te Ching: "The
   Tao  which  can be spoken of is not the true Tao." The implication is
   often that the X is a mystery accessible only to the enlightened. See
   the  {trampoline}  entry  for  an  example,  and  compare  {has the X
   nature}.

[glossary]
[Reference(s) to this entry by made by: {has the X nature}]