Scale & Estimation

"Commodore Grace M. Hopper, USN (covered)" by James S. Davis — https://commons.wikimedia.org/wiki/File:Commodore_Grace_M._Hopper,_USN_(covered).jpg — Public domain (work of the U.S. federal government, 17 U.S.C. §105)

"Der Geburtstagskuchen (The Birthday Cake)" by Eduard Geselschap — https://commons.wikimedia.org/wiki/File:Eduard_Geselschap_Der_Geburtstagskuchen_1872.jpg — Public domain (Oil on canvas by Eduard Geselschap (1814–1878), signed and dated 1872; the painter died 5 January 1878, so the work is in the public domain in the Netherlands and Germany and across the EU (life plus 70 years) and in the United States (published before 1931, per the file page). Faithful photographic reproduction of a two-dimensional public-domain work (PD-Art; EU Directive 2019/790 art. 14); the file is marked with the Public Domain Mark 1.0)

"1882 transit of venus" by US Naval Observatory — https://commons.wikimedia.org/wiki/File:1882_transit_of_venus.jpg — Public domain (work of the U.S. federal government, 17 U.S.C. §105 (the Commons file page tags it as made by U.S. Navy staff as part of official duties); independently, an anonymous work made in 1882, so any U.S. term (at most 120 years from creation for an unpublished anonymous work) and any EU term for an anonymous work have expired)

"View of Aswan - Along the Nile" by Antonio Beato — https://commons.wikimedia.org/wiki/File:Antonio_Beato_-_View_of_Aswan_-_Along_the_Nile_-_1993.94_-_Cleveland_Museum_of_Art.tif — CC0 1.0 (https://creativecommons.org/publicdomain/zero/1.0/); modified: converted from the 5,000 × 3,681 px TIFF original to JPEG (quality 92, same pixel size, embedded color profile kept); no crop, retouching or color change