Slot machines used to be massive, with cabinets over 40 inches tall and packed...

https://blogfreely.net/teresa-long85/why-do-slot-games-use-icons-instead-of-text-labels-on-mobile

Slot machines used to be massive, with cabinets over 40 inches tall and packed with buttons and lights. Today, all that fun fits neatly in a 6-inch pocket-size screen