Definition
A planchette is a small, typically heart-shaped piece of wood or plastic, often equipped with wheels or legs. It's most famously used in Ouija boards to supposedly communicate with spirits. Participants place their fingers lightly on the planchette, and it moves around the board to spell out messages. Skeptics argue that the movement is due to the ideomotor effect, unconscious muscle movements influenced by suggestion. Whether supernatural or not, it's a fascinating cultural artifact.