What's the deal with cats?

Quinn has a big wire crate.  She doesn't spend much time in it any more, just when I'm leaving home as she sleeps loose in my room at night.  Why is it that most every day I go in my room and see this?

Added to that, I keep a big bowl of water in the kitchen for all the pets, where do these cats drink?  From the small bowl I keep for Quinn in her crate.  I will never figure them out.