Slot machines started as giant cabinet beasts, sometimes towering over 6 feet...

https://fair-wiki.win/index.php/What_Does_It_Mean_When_a_Slot_UI_Is_%22Portrait-Friendly%22%3F

Slot machines started as giant cabinet beasts, sometimes towering over 6 feet tall. Now, those same games fit in the palm of your hand on screens just 6 to 7 inches wide