Slot machines used to be these huge cabinets, sometimes over 40 inches tall,...

https://wiki-zine.win/index.php/How_Did_Slot_Machines_Go_from_Furniture_to_Software%3F

Slot machines used to be these huge cabinets, sometimes over 40 inches tall, taking up a big chunk of casino floor space. Now, you can play similar games on screens as small as 6 inches wide—right on your phone