Slot machines used to take up entire casino floors with cabinets over 50 inches...

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

Slot machines used to take up entire casino floors with cabinets over 50 inches tall. Now, these games have shrunk to fit comfortably on phone screens just 6 inches wide