Slot machines used to take up entire casino floors with cabinets over 50 feet...

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

Slot machines used to take up entire casino floors with cabinets over 50 feet tall. Now you can play the same games on screens as small as 6 inches—right on your phone