Once, slot machines were giant cabinets over 50 feet tall, heavy and bulky on...

https://wiki-tonic.win/index.php/How_Big_Is_a_Slot_Machine_Cabinet_in_a_Casino%3F

Once, slot machines were giant cabinets over 50 feet tall, heavy and bulky on the casino floor. Now, those same games fit comfortably on smartphone screens just 6 inches across. This shift means you can spin the reels anywhere without the noise or crowds