When she discovered that Jim Morrison of The Doors read "The History of Magic" by Kurt Seligmann, she bought it. Though she's not a reader, she liked the illustrations and incorporated some of the characteristics of "Hermetic Conversation" in her cover, since the other picture, which inspired her from a 1960's Good Housekeeping magazine also had two people talking. In reference to her book, the twelve keys can be referred to the 12 months of the year, since she includes dates when she's writing. They can also be referred to the different journals she writes in that are being held like cards. The position of the stars were like the luck of the draw relating to agriculture back then, which is why I put the "cheddar" man wizard on the "basil" card that looks like Stonehenge, for the cover. He also appears to be a flask used in alchemy to create the philosopher's tincture.
When touching liquid metals, the philosopher's tincture was thought to change them into gold or more effectively, a fake bright yellow. The cure all tincture was also be white, dark red, sky-blue or green. It has several names and appeared as "Aimwater" in a dream. The "Valentine" that has 2 cards crossed with a blue vein and a red artery similar to a "Hermetic Androgyne", which is half male, half female, and half sun, half moon. Where the cards intersect is the philosophic egg, which symbolizes, like the Serpent, the universe. Hermes Trismegistus says that the below is like the above. This was to be interpreted not as an earthly replica Independent of heavenly things, but as a reflection. Like in a mirror, everything is seen in reverse, as illustrated by Basil Valentine in "Hermetic Conversation" in "The Principles of Alchemy and the Philosophers' Stone." This is the uniting of father and son, but her cover has a male and female. This is similar to how pastel stones are Elliott's past, but any wizard can replace a stone, so it will go off path.