The Ninth Sphere; Yesod, on the Qabalistic Tree of Life. This Sphere is just above the Tenth Sphere Malkuth (or Kingdom)and is also associated with the Moon.

This is the place where ideas form into possible manifestations.

In the Official Instructions of the A.:A.: Yesod is the place where the initiate receives among the magical grades the title: Zelator.

Reference should be made to the astral plane, dreams, and Yetzirah.