Pineal Gland
"Consult your pineal gland" is a common saying in Discordianism. Although it has never been proven, the pineal gland is believed by some, such as Rick Strassman, to produce trace amounts of DMT (dimethyltryptamine), a psychedelic chemical which is believed to play a role in dreaming and other mystical states. The pineal gland was also used in Descartes's explanation of Cartesian Dualism as the "seat of the soul" and the connection between the material and immaterial world. In some cases it is referred to as "the atrophied third eye". It has also been suggested that the third eye (Ajna) physically resides at this location between the two hemispheres of the brain.
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