Athanasius Kircher, Organum Mathematicum, or Cista mathematica or Arca, late 17th – early 18th century. Italy.

The inside of the chest is divided into nine compartments: Arithmetic, Geometry, Art of fortifications, Chronology, Horography, Astronomy, Astrology, Steganography, and Music. It’s a sort of portable encyclopedia, or comprehensive system for the classification of knowledge. Museo Galileo


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