The Law of Identification or imitation is where one entity assumes the characteristics of another. The more the first entity knows about the second the better the imitation. If this produces a strong association between both entities it might almost involve becoming the other entity itself. A temporary identification can be considered a divine or spirit possession. This law is used by witches when invoking the spirit of the Mother Goddess to enter the high priestess and Cernunnous to enter the high priest.
(See The Laws of Magic.) A.G.H.
Source: 44.