Cards, roulette wheels and slot reels preserve casino history in their details....

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

Cards, roulette wheels and slot reels preserve casino history in their details. A look at 1895 San Francisco shows how familiar games took shape, and how small design choices can reveal the people, places and mechanics behind the play.