The Card Catalog

You open the box to find...

A fist-sized brass sphere, with a small nail-sized spike protruding from it. A thin, deep groove runs around the sphere, from which the spike originates. Upon closer inspection, you notice the surface of the sphere is a single piece, and the groove runs around it in patterns like a maze. As you pick it up to inspect it, you notice that the spike slides along the groove with a mechanical whirring sound, clicking at every turn. The spike appears to always eventually move to point in the same direction. Currently, north-northeast.

(If the holder utters the title of a book, the spike will point towards that book. If the holder says "absolute" or "relative", the spike will point to the final destination or in the direction the user should walk, fly, or swim to get there, respectively.)