I was reading earlier about the mysterious Roman dodecahedrons: These bronze, hollow figures nubbed at the verices, are of unknown use and origin, with countless theories from measuring device for things as diverse as artillery ranges to astronomical measurements, to a sowing aid for winter grain. They've been considered religious or ritual objects, weaving tools and more. So..What uses might a magus find for them? What form and effect bonuses do you think mighe be derived from them?
Learned magi might know this: " Of the fifth Platonic solid, the dodecahedron, Plato obscurely remarked, "...the god used [it] for arranging the constellations on the whole heaven". Aristotle added a fifth element, aithēr (aether in Latin, "ether" in English) and postulated that the heavens were made of this element, but he had no interest in matching it with Plato's fifth solid."
Aether is not an Hermetic Form, unless you have gotten close to a certain Dies Irae (p.39 there) in your saga. So most magi won't be able to find this correspondence, until some Criamon finally show them with a true Hermetic Breakthrough. But their project might be surrounded by several dodecahedra.