lucifelle:

Robert Fludd (1574-1637) was an English physician who had a very broad knowledge and wrote books on many subjects such as anatomy, optics, hydraulic engineering, alchemy, astrology, mystical math, geomancy and rosicrucianism.

The Hyle Triangle is a design from Fludd’s book ‘Utriusque Cosmi Historia’ written in 1617 and is an attempt to define the intersecting relationship between the physical and spiritual worlds. Fludd wrote that it may be impossible to define and one can only come close by using an analogy.