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

https://wiki-global.win/index.php/Why_Do_Modern_Casino_Cabinets_Include_Internal_Wiring_and_Speakers%3F

Slot machines used to take up entire casino floors with cabinets over 50 inches tall. Now, these games have shrunk to fit comfortably on phone screens just 6 inches wide