Cards, roulette wheels, and slot reels hold casino history in their marks and...

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

Cards, roulette wheels, and slot reels hold casino history in their marks and moving parts. An 1895 slot machine shows how games changed, while single-zero and double-zero wheels reveal how one small design choice shaped the odds and feel of play.