 The ability of God to become hidden from perception is called "Restriction" (Tzimtzum).Hiddenness makes creation possible because God can become "revealed" in a diversity of limited ways, which then form the building blocks of creation.Kabbalistic texts, including the "Zohar", appear to affirm dualism, as they ascribe all evil to the separation from holiness known as the Sitra Achra ("the other side") which is opposed to "Sitra D'Kedushah", or the Side of Holiness.