89. Certain spirit manifestations lend themselves quite easily to being imitated, but even though they may be exploited like so many other phenomena by means of trickery and sleight-of-hand, it would be absurd to conclude that they do not actually exist at all. For anyone who has studied and knows the normal conditions under which they may be produced, it is easy to tell an imitation from an authentic manifestation. Furthermore, an imitation could never be complete and could deceive only unknowing observers incapable of understanding the characteristic nuances of authentic phenomena.
