I just posted more on Fludd, including a bit of his “science of pyramids,” although not enough to fully appreciate the geometry.

Note that the Yeats link you gave has one of Fludd’s “interpenetrating pyramid” diagrams. Thanks for the link.

However, there is in some of his drawings an intriguing mathematical exactness, that does away with any all-too-easy “mysticism”.

William Butler Yeats, many centuries afterward,
has rediscovered this “trascendental geometry”, particularly the theme of cones, in his own
“A Vision”: see http://www.yeatsvision.com/Geometry.html

By the way, Yeats’ uncanny book could and should find its way into your blog.