Other witches may not like clairvoyance or healing in those terms but wish to become and also they are taught to induce trance. This leaves them open to spirit possession under the guidance of teachers, whereby a spirit controls the physical body and uses them for a particular type of phenomena that the spirit wishes to control, whether healing, clairvoyance, clariaudience, physometry, materialization, telekinesis, apports (apport), or whatever the spirit is capable of doing within its own shere.