Jihe yuanben 幾何原本 (motion/films/jihe-yuanben), 100 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 end card carries the same credits.

Images

- Jihe yuanben 幾何原本, vol. 1, sp=7, 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, title page, fol. 1r and fol. 21v. Boston College Library, via
  Internet Archive. Public domain by age.
- Christoph Clavius, Euclidis Elementorum libri XV, 3rd ed., Cologne, 1591,
  p. 20. ETH-Bibliothek Zürich, e-rara. Public Domain Mark 1.0.
- 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 cut along its printed
  lines, and the pieces are moved and rearranged. These adapted images are
  licensed CC BY-SA 4.0.

Whether the film as a whole is published under CC BY-SA 4.0 is the
publisher's decision. If Source Library confirms that the page images are
public domain, the BY-SA label can be dropped (NOTES.md, Credits and rights).

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