HJG: Here it is. Let me tell you how it works. The holder of the Jar makes a big show of the fact that the Jar itself holds the power. They invite a guest onstage to cast detection spells, revelation charms, anything the guest can think of, to serve a singular purpose: demonstrating that the holder themselves is using no magic. That there is no magical interference with the workings of the Jar itself. That the Jar is independent, empirical.