SPIRAL NOTEBOOK COVERS
They used to have a hundred pages between them.
But spirals lose their pages over time. They may be torn off precociously to destroy evidence, or develop paper fatigue by being handled back and forth excessively.
When the last page is gone, back and front covers meet for the first time. This might be a happy occasion, if they happen to be feeling lonely and empty inside. Or it could be a troubled one, in case they’ve become too well adjusted to their isolation.
In either case, they’re handcuffed to sturdy spirals, unable to go anywhere.