200 Francs - René Descartes

正面描述	Central vignette presents a portrait of René Descartes (1596–1650), French philosopher, mathematician, and scientist, after a classical engraving style. Inscriptions identify the subject and denomination within a guilloche underprint, with the overprint legends NON VALABLE and ECHANTILLON confirming specimen status.
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背面描述	Vignette incorporates a view of the Cathedral of Notre-Dame de Paris alongside a pen, a schematic rendering of the human brain, and a figure observing the night sky, evoking Descartes' philosophical and scientific legacy. A cursive Latin inscription renders his celebrated phrase from Principia Philosophiae (1644): Ego cogito, ergo sum. Specimen and essay overprints appear alongside the series notation U.128 and year 2015.
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防伪描述	Geometric shapes by transparency type Pyramids © Polette (CC BY-NC-SA)
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