Slot machines used to fill casino floors with massive cabinets often over 50...

https://cashsexpertinsight.talesignal.com/posts/did-video-slots-make-slot-machines-bigger-or-smaller

Slot machines used to fill casino floors with massive cabinets often over 50 feet tall in early designs. Now you can play those games on screens as small as 6 or 7 inches right in your pocket