A 12th Century CE, illustration depicting the seven liberal arts: grammar, rhetoric, and logic (the trivium) and geometry, arithmetic, music, and astronomy (the quadrivium).

British Library

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Visiting around The Crystarium.
I like how lively the place is when around The Quadrivium area. 🙂

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Aquí tenemos una representación medieval de la Ésta se dividía en quadrivium y trivium. La siete artes que se enseñaban eran : música, dialéctica, retórico, gramática, astronomía, geometría y aritmética (1/2)

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中国の神話に出てくる創造神は
女媧と伏羲なんですが、彼らは手にコンパスと定規を持っているんですよね。自分なんかはどうしてもQuadriviumを連想してしまう。真実に美しい円から世界は始まるのだ。

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Quadrivium: Animals displaying instruments of astronomy instead of the more usual musical instruments in a margin of Ptolemy's "Almagest," manuscript from the early 1300s: BL Burney 275, f. 390v: pillar sundial, equatorium, astrolabe, and sextant

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