A device for teaching fractions to the visually impaired, from the 1910 book “Der Blindenunterricht. Vorträge über Wesen, Methode und Ziel des Unterrichtes in der Blindenschule”, via Bitcraft Lab.
A solar corona on June 8, 1918 from the Adolfo Stahl Lecture Series:
“From a photograph with the 40-foot camera of the Crocker Eclipse Expedition of the Lick Observatory to Goldendale, Washington. Exposure, 0m21s to 25s of totality. South is at the left, west at the top.”
Via a experiment in auto-curation for a residency at Internet Archive.
I am fascinated by how hologram-like those blocks look, almost like collage (via: Serious Eats)