Somehow, Orlov knows this object. He wonders if he is dreaming the madman’s dream, or if he is merely haunting it, a ghost lingering in the house of the lunatic occultist’s unconscious mind. Regardless, the artifact is familiar to him.
It is Lector’s Pentajulum, a knot of tubes and small chambers reminiscent of a human heart but made of a colorful, unknown substance with properties akin to both amber and sea glass. The Pentajulum appears inert, and yet a tiny shift in position seems to alter its design — a trick of the light or of the eye, or some queer geometry the human mind cannot perceive.
–Mike Mignola & Christopher Golden, Joe Golem and the Drowning City