plato.png
Marble bust of Plato — Roman copy after a Greek original by Silanion, Musei Capitolini MC1377. Photograph by Marie-Lan Nguyen (Wikimedia Commons user Jastrow), released into the public domain.
Source: File:Plato Silanion Musei Capitolini MC1377.png,
Wikimedia Commons. Downloaded at 1280 px width;
plato__line.png is the print line-art version, generated
with img2line --backend neural --style contour_style.
descartes.png
Portrait of René Descartes, after Frans Hals (17th century), Musée du Louvre. The painting is public domain by age. The exact scan this file came from was not recorded when it was added to the repository.
descartes__line.png is the print line-art version, same
generator as above.
brain-in-a-vat.png
The standard brain-in-a-vat diagram, a variant of the illustration by
Wikimedia Commons user was a bee (whose language versions are
released as public domain or CC0; the vector brain derives from
Image:Central nervous system.svg by grm_wnr).
Provenance not fully verified. This file predates
the current work and its dimensions (1280×1033) do not match the English
Commons version (File:Brain in a vat (en).png, 819×872), so
it is a different rendering or variant and the exact source file could
not be identified. Worth confirming before the next public deploy — if
it cannot be matched, the Commons original is a drop-in public-domain
replacement.
brain-in-a-vat__line.png is the print version: the same
diagram thresholded to pure black-on-white
(magick … -colorspace gray -threshold 55%), since the
source is already line work and an edge detector would only degrade
it.
Not used, deliberately
Stills from The Matrix (1999) are copyrighted, and this repository builds a published site. The film is discussed in the Lesson 2 text and named in the caption of the vat diagram, which carries the same idea without reproducing the film.
what-is-truth.jpg
Nikolai Ge, “What is Truth?” Christ and Pilate (1890),
Tretyakov Gallery. Public domain by age. Source:
File:What is truth.jpg, Wikimedia Commons, downloaded at
1280 px width. Core L3 slides and jigsaw handouts.
cardiff-giant.jpg
The excavation of the Cardiff Giant, Cardiff, New York, 1869.
Photographer unknown; public domain by age. Source:
File:Cardiff Giant 2.jpg, Wikimedia Commons (550 px, the
largest copy there). Core L3 slides and jigsaw handouts.
aristotle.jpg
Marble bust of Aristotle, Roman copy after a Greek bronze by
Lysippos, Museo Nazionale Romano, Palazzo Altemps Inv. 8575. Photograph
by Marie-Lan Nguyen (Wikimedia Commons user Jastrow, 2006), released
into the public domain. Source:
File:Aristotle Altemps Inv8575.jpg, downloaded at 1280 px
width. Core L3 slides and jigsaw handouts.
william-james.jpg
William James, photograph by Notman Studios, Houghton Library,
Harvard University (MS Am 1092 (1185), Series II, 23). Public
domain by age. Source:
File:William James b1842c.jpg, Wikimedia Commons,
downloaded at 1280 px width. Core L3 slides and jigsaw handouts.
cats-paw-nebula.jpg
The Cat’s Paw Nebula (NGC 6334), Webb NIRCam image released 10 July
2025. Credit: NASA, ESA, CSA, STScI — NASA imagery is
in the public domain. Source:
File:Cat's Paw Nebula (NIRCam Image) (2025-129).png,
Wikimedia Commons, downloaded at 1920 px and re-encoded as JPEG at 1600
px width. Core L4 slides.
muller-lyer.png
The Müller-Lyer figure, drawn for this course with a short Python/PIL script (two equal shafts, inward and outward fins; white on transparent). No external source; no rights reserved. Core L4 slides.
russell.png
Bertrand Russell as a young man, photographer not identified; the
Commons file is a background-removed derivative (user Conquistador) of
File:Honourable Bertrand Russell.jpg, both public
domain. Source:
File:Bertrand Russell transparent bg.png, Wikimedia
Commons, downloaded at 1280 px width. Core L4 slides.
berkeley.jpg
John Smibert, Bishop George Berkeley (c. 1727–30).
Public domain by age; the scan is the Google Art
Project file
File:John Smibert - Bishop George Berkeley - Google Art Project.jpg
on Wikimedia Commons, downloaded at 1280 px width. (The other Commons
copies of this portrait carry a third-party copyright claim from the
National Portrait Gallery, London, and were avoided.) Core L4
slides.
locke.jpg
Godfrey Kneller, Portrait of John Locke (1697), State
Hermitage Museum. Public domain by age. Source:
File:Godfrey Kneller - Portrait of John Locke (Hermitage).jpg,
Wikimedia Commons, downloaded at 1280 px width. Core L4 slides.
peirce.jpg
Charles Sanders Peirce, photograph of about 1891, photographer
unknown. Public domain by age. Source:
File:Charles Sanders Peirce theb3558.jpg, Wikimedia
Commons, downloaded at full size (762 px). Core L3 jigsaw expert briefs,
as a grayscale photograph.
newton.jpg
Godfrey Kneller, Portrait of Isaac Newton (1689).
Public domain by age. Source:
File:GodfreyKneller-IsaacNewton-1689.jpg, Wikimedia
Commons, downloaded at 1280 px width. Core L3 jigsaw home sheet; used as
a grayscale photo, the line-art version was tried and discarded.
clipper.jpg
Currier & Ives, Dreadnought, a Fast Clipper Ship (“off
Tuskar Light”), lithograph, c. 1860. Public domain by
age. Source:
File:Dreadnought, a Fast Clipper Ship, circa 1860, print by Currier and Ives.jpg,
Wikimedia Commons (1029 px, the largest copy there); the scan’s caption
strip and border were cropped off and the file converted to grayscale.
Core L3 jigsaw expert briefs, as an image for Neurath’s ship. Hokusai’s
Great Wave was tried first and replaced: its boats are being
swamped, not rebuilt.
aristotle-gray.jpg, what-is-truth-gray.jpg
Grayscale copies of aristotle.jpg and
what-is-truth.jpg (credited above) for the Core L3 jigsaw
handouts, which print every image as a grayscale photograph; the colour
originals stay in use in the slide decks.
Line-art siblings added 2026-09-15
aristotle__line.png and
what-is-truth__line.png are print line-art versions of the
files credited above, generated with
img2line --backend neural (contour_style and
anime_style respectively). They are kept for the slide
decks and unit text; the L3 jigsaw handouts use every image as a
grayscale photograph, line art having been tried there and rejected.