This text that you will now read, accompanied by its illustrations, gives us the keys to understanding the operation of the Great Work, from the Rosicrucian worldview. For some, it provides the device to achieve the wonder of catching the Spiritus Mundi; For others, it is an operation related to philosophical magnets. You will have the truth, dear reader, with this brilliant, unpublished work, for the first time translated into Spanish with abundant footnotes that help reveal what its pages are plotting.