The Ouija board, often associated with the supernatural, was actually patented in 1890 by Baltimore businessmen Elijah Bond and Charles Kennard as a parlor game. Its name, "Ouija," is speculated to be a combination of the French ("oui") and German ("ja") words for "yes." For most of the 20th century, it was considered a wholesome family pastime, even appearing on a 1919 Saturday Evening Post cover by Norman Rockwell. The board's reputation shifted significantly in 1973 after the horror film The Exorcist portrayed it as a tool for demonic possession.

The seemingly mysterious movement of the board's planchette is explained by a psychological phenomenon called the ideomotor effect. First named in 1852, this concept describes how individuals make tiny, involuntary muscle movements based on their own subconscious thoughts and expectations. It is these unconscious movements from the users, not spirits, that guide the pointer. The common "rule" that users must move the planchette to "Goodbye" to "close a portal" is not part of the original game but rather a piece of modern folklore popularized by movies.

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