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

https://delta-wiki.win/index.php/Why_Did_Early_Slot_Machines_Use_a_Lever%3F_Exploring_Classic_Slot_Machine_Design

Slot machines used to fill entire casino floors with cabinets over 50 feet tall and screens bigger than 40 inches. Now, those same games fit neatly on phone screens just 6 inches wide