Fabergé egg
en.wikipedia.org
en.wikipedia.org
https://www.forbes.com/sites/anthonydemarco/2015/02/14/a-jew...
Each one was unique, and many of them represented important moments in recent Russian history - there's one that commemorates the completion of the trans Siberian railway for example.
Given what happened next, you could say they accidentally document the fall of the Russian empire... through the medium of decorative eggs!
https://www.godt.no/aktuelt/i/vAnvo4/hvor-ble-det-av-drage-e...