The Organum Mathematicum was an information device or teaching machine that was invented by the Jesuit polymath and scholar Athanasius Kircher in the middle of the 17th century.
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The Organum Mathematicum was later described in a 1668 book of the same title by Gaspar Schott, who was Kircher's pupil.
The Arca was followed by, and closely related to another Kircher invention, the Organum Mathematicum, described by Kircher's pupil, Gaspar Schott.