Ouija Boards

[themanfromsaturn]

They function on something called the 'Ideomotor Effect'. Basically, we all have little nerve twitches, spasms, and other small fine motor adjustments. Get multiple people together trying to hold the same object steady, and we wind up involuntarily trying to correct for each other, pulling it in one direction or the other which creates the illusion of spontaneous movement. Once in motion, our expectations subtly influence the direction the object moves, and where it comes to rest.

It's an interesting excercise in applied psychology, but not an oracle.