Cats like bookshelves for several reasons:
1. *Height and elevation*: Cats enjoy climbing and perching themselves high up, and bookshelves provide the perfect opportunity to do so.
2. *Cozy and enclosed spaces*: Bookshelves often have narrow ledges or shelves that create cozy, enclosed spaces for cats to curl up in.
3. *Warmth and comfort*: Bookshelves can be a warm and comfortable spot, especially if they're near a window or a heating vent.
4. *Observation point*: Bookshelves offer a high vantage point for cats to observe their surroundings, watching birds outside or keeping an eye on their human family members.
5. *Hiding and security*: Cats may feel secure and hidden when they're nestled among books or other items on a bookshelf.
Remember, every cat is different, but these reasons might explain why many cats enjoy bookshelves!