Psychomanteum

A psychomanteum is a small, enclosed area set up with a comfortable chair, dim lighting, and a mirror angled so as not to reflect anything but darkness, intended to be a means of clairvoyance, or of attaining spiritual visions. Psychomanteums are, apparently, used in catoptromancy, presumably with the aide of a scrying mirror.

Appearances

 * Harry Potter and the Philosopher's Stone