Two C64s Plus a Pile of Floppy Disks Equals One Accordion

"As for what would go between the ends, accordion bellows are a set of semi-rigid sheets, typically rectangular with an opening in the middle. The sheets are attached to each other alternating between the inner and outer edges. Another flash of insight: The bellows could be made from a stack of 5.25-inch floppy disks."
https://spectrum.ieee.org/two-commodore-64s-one-accordion