Robert Fludd, Philosophia Moysaica.
Gouda, Pieter Rammazeyn, 1638

Various of Fludd's works equate kabbalistic and alchemical symbolism. In Philosophia Moysaica Fludd (1574-1637) re-interprets the kabbalistic symbolism of the two appearances of the letter alef as the alchemical transmutation of the dark prima materia into the luminous Philosophers' Stone.