On the Qabalistic Tree
the Ninth Sphere
. Yesod, or 'Foundation
' is the realm
of the astral
and of dream
The classical planet of the Moon is associated with this Sphere.
The Magical Grade is 2=9 Zelator, it's color is purple in the Queen (or Empress) Scale.
Yesod is connected to four other Spheres by the Paths numbered; 32, 30, 28 and 25. These connect to (in the same order) the Spreres; Malkuth, Hod, Netzach and Tiphareth.