Related material —
See the story of a British man who reportedly had a doctorate in
physics and mathematics and became a witchcraft enthusiast.
He is said to have died at 85 on September 11, 2016.
As Wittgenstein noted, it is not always clear whether the pentagram
expresses a mathematical or an experiential proposition.
For some mathematical propositions related to the pentagram,
see (for instance) John Baez's slides for his 2008 Glasgow
lecture on the number 5.
For som experiential propositions, see Pentagram in this journal.