Jihe yuanben 幾何原本 (motion/films/jihe-yuanben), v2, 74.85 s, 1920 x 1080.
Ship this text with the film wherever it is published (the description field
of the post or the video page). The film's closing title carries the same
image credits.

Images

- Jihe yuanben 幾何原本, vol. 1, sp=8 and 23, early 17th-century printing.
  Library of Congress / National Library of China (World Digital Library).
  No known restrictions.
- Athanasius Kircher, La Chine illustrée, Amsterdam, 1670, plate facing
  p. 201. Villanova University, Falvey Library. Public domain (the unretouched
  Villanova master; the CC BY-SA 3.0 Wikimedia Commons retouch is not used).
- Christoph Clavius, Euclidis Elementorum libri XV, Rome: Vincenzo Accolti,
  1574, fol. 1r and fol. 21v. Boston College Library, via Internet Archive.
  Public domain by age.
- 九章算術 Nine Chapters on the Mathematical Art, Siku Quanshu (Qing edition),
  vols 1 to 3 p. 19, and vols 7 to 9 p. 132 (the 句股容圓圖 and its note,
  supplied by the Qing editors: 原本缺圖今補). Source Library
  (https://sourcelibrary.org) / Internet Archive (CADAL). Licensed CC BY-SA
  4.0: https://creativecommons.org/licenses/by-sa/4.0/
  Changes made in this film: both pages are toned to the colour of paper
  (#d4c4a4 multiplied, contrast 0.9); on p. 132 the figure's three regions are
  coloured by their own labels (朱, 青, 黃), the figure is copied and cut along
  its printed lines, and its pieces are rearranged into a rectangle. These
  adapted images are licensed CC BY-SA 4.0.

The film is licensed under CC BY-SA 4.0:
https://creativecommons.org/licenses/by-sa/4.0/

Type: EB Garamond (Octavio Pardo) and Noto Serif CJK TC (Adobe), SIL Open
Font License 1.1.
Voices: ElevenLabs (Frederick Surrey, narrator; Yun, Mandarin reader). Music:
ElevenLabs Music API. Paper sounds: ElevenLabs sound generation.