Slot machines used to fill entire casino floors with massive cabinets over 40...

https://celebmeadow.com/from-floor-standing-machines-to-pocket-screens-the-shrinking-footprint-of-slot-games/

Slot machines used to fill entire casino floors with massive cabinets over 40 inches tall. Today, much of that action fits comfortably on a 6-inch phone screen. This shift means you can spin classic reels anywhere without a trip to the casino