Slot machines used to fill casino floors with cabinets over 50 feet tall,...

https://zanesnewthoughtss.evergrovio.com/posts/do-modern-slot-cabinets-still-need-cooling-components

Slot machines used to fill casino floors with cabinets over 50 feet tall, packed with flashing lights and sounds. Today, many of those games fit right into your pocket on screens as small as 6 inches