Public-domain artwork — sources & provenance
Public-domain artwork — sources & provenance
All works are in the public domain (artist died >100 years ago; faithful photographic reproductions of PD 2-D works are PD). Downloaded from Wikimedia Commons, 2026-08-27, then downscaled to 2400px and cropped where noted.
| File | Work | Artist, date | Commons source |
|---|---|---|---|
| friedrich-two-men-moon.* | Two Men Contemplating the Moon | Caspar David Friedrich, c.1825–30 | File:Friedrich - Two Men Contemplating the Moon.jpg |
| friedrich-abbey-oakwood.* | The Abbey in the Oakwood (Abtei im Eichwald) | Caspar David Friedrich, 1809–10 | File:Caspar David Friedrich - Abtei im Eichwald - Google Art Project.jpg |
| friedrich-monk-by-the-sea.* | The Monk by the Sea (Der Mönch am Meer) | Caspar David Friedrich, 1808–10 | File:Caspar David Friedrich - Der Mönch am Meer - Google Art Project.jpg |
| turner-norham-castle-sunrise.* | Norham Castle, Sunrise | J. M. W. Turner, c.1845 | File:Jmw turner, norham castle, alba, 1845 ca.jpg (cropped to canvas — gallery frame removed) |
Option D — Hilma af Klint & 19th-c astronomical plates
| File | Work | Artist, date | Commons source |
|---|---|---|---|
| hilma-swan-17.webp | Svanen (The Swan), No. 17, SUW/UW series | Hilma af Klint, 1915 | File:Hilma af Klint, 1915, Svanen, No. 17.jpg |
| hilma-ten-largest-7-adulthood.webp | The Ten Largest, No. 7, Adulthood (WU/Rosen, Group IV) | Hilma af Klint, 1907 | File:Hilma af Klint - The Ten Largest No. 7 - Adulthood - 1907.jpg |
| hilma-altarpiece-1.webp | Altarpiece, No. 1, Group X | Hilma af Klint, 1915 | File:Hilma af Klint - Altarpiece No. 1 Group X (13919).jpg |
| trouvelot-orion.webp | The Great Nebula in Orion (Trouvelot Astronomical Drawings) | Étienne Léopold Trouvelot, 1875–76 | File:Trouvelot- The great nebula in Orion - 1875.jpg (cropped: plate border + letterpress caption removed) |
| trouvelot-hercules.webp | Star Cluster in Hercules (Trouvelot Astronomical Drawings) | Étienne Léopold Trouvelot, 1877 | File:Étienne Léopold Trouvelot, "Star Cluster in Hercules…" 2006 48 14v1.jpg |
Hilma af Klint (1862–1944): works are public domain in Sweden (life+70) and in the US (published before 1929). Trouvelot (1827–1895): public domain worldwide.
Social preview
site/assets/og.jpg (1200×630) is the social/OG card — a crop of Friedrich's
Two Men Contemplating the Moon with the page's own type over a Prussian scrim.
Source: design/og-image.html, rendered with headless Chrome:
"/Applications/Google Chrome.app/Contents/MacOS/Google Chrome" --headless=new \
--disable-gpu --hide-scrollbars --force-color-profile=srgb \
--window-size=1200,630 --virtual-time-budget=6000 \
--screenshot=site/assets/og.png "file://$PWD/design/og-image.html"
sips -s format jpeg -s formatOptions 82 site/assets/og.png --out site/assets/og.jpg && rm site/assets/og.png