Casino history lives in objects people handled: cards, roulette wheels shaped...

https://varimail.com/articles/why-reels-became-the-default-way-to-show-slot-outcomes/

Casino history lives in objects people handled: cards, roulette wheels shaped by single-zero or double-zero rules, and slot reels that made chance visible. An 1895 detail opens a closer look at the craft and changing spectacle behind familiar games.