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The Ouija pointer is moved by the participant's muscles, and the spirit influencing those moves sometimes sees through the human eyes. Blindfold the people, and naturally the instrument would become useless.

One of our experiments involved sending a message through one Ouija board to another that was about 500 miles away. The message arrived word for word and pretty much in real time.

There is a spirit world. The spirit world can influence ours, and even communicate with it. I can, to this day, communicate with spirits through automatic writing. When the Ouija board is used extensively, people tend to make such intercommunication easier. Initially, a number of people are needed to "force multiply" the process so that the spirit can move the pointer. Later, an individual can provide a spirit access to the board. Auto-writing can develop after that, which is much the same with fine enough motor control to use a pen or pencil.

I don't do that anymore because I have no way to evaluate possible risks.