in the spirit of John Cleese's talk on creativity

and the alternation between "open" and "closed" modes that he says is
critical for creative thinking

this has absolutely no tests or documentation.  those are forthcoming.

git-svn-id: svn://svn.twistedmatrix.com/svn/Twisted/branches/desynchronize-2673@43166 bbbe8e31-12d6-0310-92fd-ac37d47ddeeb