A small polished rock sits in a padded velvet case, kept snugly in place and protected from the elements. In good lighting, a mosaic of carved lines can be made out, only slightly darker than the cerulean stone. They form a geometric pattern of some kind, and when you grasp the rock, a transparent blue hand appears in the air next to you. It seems to emulate the gestures you call to mind, making this an invaluable tool for spellcasting if one is an amputee.
