Constructivist Montage — "410 Days" (library demo)
Every third-party asset in the film, with its source and licence. Download links and the seconds used: SOURCES.md / SOURCES.jsonl.
An unofficial film made from public archives; it is not affiliated with or endorsed by the Empire State Building or any company named here.

MOVING IMAGE
- "Empires of Steel: The Story of a Supreme Achievement in Steel Construction" (1930–31), presented by the American Bridge
  Company (subsidiary of the United States Steel Corporation), a Pathescope Production. Silent, black and white.
  Public domain in the United States: published 1930–31 with no copyright notice on its title, credit or end cards;
  Internet Archive marks it Public Domain Mark 1.0; listed as a 1930 film by the Harvard Business School Baker Library
  U.S. Steel exhibit (https://www.library.hbs.edu/special-collections-and-archives/exhibits/us-steel/films-tv).
  https://archive.org/details/EmpiresOfSteel  (16 mm transfer, end card "Source: Margaret P. Pierson")
  Changes: excerpts only, gate edge cropped, denoised, scaled (lanczos, at most 2.5x of the source on screen), graded to
  the ink / paper duotone; the film's own title, credit and end cards and its intertitles are not shown.

PHOTOGRAPHS (Lewis Hine, 1930–31; graded to the duotone, cut out with u2net_human_seg and a paper border)
- "Photograph of a Workman on the Framework of the Empire State Building", Lewis Hine. U.S. National Archives,
  NAID 518290 (Records of the Work Projects Administration, RG 69). Public domain.
  https://commons.wikimedia.org/wiki/File:Photograph_of_a_Workman_on_the_Framework_of_the_Empire_State_Building_-_NARA_-_518290.jpg
- "Icarus, Empire State Building", Lewis Hine, 1930. The Metropolitan Museum of Art, released under CC0 1.0
  (https://creativecommons.org/publicdomain/zero/1.0/) through the Met's Open Access donation to Wikimedia Commons.
  https://commons.wikimedia.org/wiki/File:Icarus,_Empire_State_Building_MET_DP106525.jpg
- "Empire State Building", Lewis Hine, 1930s. The Metropolitan Museum of Art, CC0 1.0 (as above).
  https://commons.wikimedia.org/wiki/File:Empire_State_Building_MET_DP106404.jpg

DOCUMENT
- "What Everybody Wants to Know About Empire State: Facts and Figures About the World's Greatest Structure",
  Empire State, Inc., 1931 (catalogued "[1930?]"). Columbia University Libraries, Durst Old York Library:
  "Digital version available with no restrictions". Public domain (US publication with no copyright notice).
  https://archive.org/details/ldpd_11290475_000
  Used: the statistics page (two sentences marked in red), the four scale outlines of its height comparison (lifted
  off the page and stood on one ground line), the map, the heading "The Men Who Did the Job", a strip of the chronology.

SOUND
- "WWS Rivetingmachine" by Work With Sounds / Konrad Gutkowski, licensed under CC BY 4.0
  (https://creativecommons.org/licenses/by/4.0/). https://commons.wikimedia.org/wiki/File:WWS_Rivetingmachine.ogg
  Changes: short slices, levelled.
- "Steam Whistle at Georgia Tech" by Zeroping, CC0 1.0. https://commons.wikimedia.org/wiki/File:Steam_Whistle_at_Georgia_Tech.ogg
- "Construction" by Dsw4, public domain. https://commons.wikimedia.org/wiki/File:Construction.ogg (ambience bed)

MUSIC
- Original score written for this film (audio/mix.py).
- Samples (CC0): VS Chamber Orchestra: Community Edition (Versilian Studios), Versilian Community Sample Library (Versilian Studios).

VOICE
- Narration: Kokoro-82M text-to-speech (Apache-2.0), voice am_michael, run offline with kokoro-onnx (MIT).
- Speech check: faster-whisper (MIT).

FONTS (SIL Open Font License 1.1; texts in fonts/; from github.com/google/fonts, fetched by tools/fonts.py)
- Noto Sans SC, Adobe / Google (subset)
- Oswald, The Oswald Project Authors
- Space Mono, The Space Mono Project Authors

TOOLS
- Cut-outs: U²-Net human segmentation (u2net_human_seg, Apache-2.0; ONNX from https://github.com/danielgatis/rembg/releases),
  run through onnxruntime (MIT).
- Rendering: headless Chromium (Playwright); ffmpeg.

FACTS
- Every fact on screen and in the voice-over is sourced in FACTS.md (claim, URL, quoted wording).
