This is why you should never spread patterns out, and then leave the room even for a second, even if you think the cat is safely outside!
Amazingly, this story has a happy ending.
I spread patterns out, went to put on the kettle. Cat saw an opportunity. Cat occupied patterns.
Cat fell asleep.
Cat slept, and slept, and slept, and slept, rolling over to show her tummy, and curling up, and stretching out, and yawning, and rolling over and sleeping more, all while I bit my nails and prayed.
Then cat woke up, chuckled evilly to herself, having caused just as much anxiety as if there had been real destruction, and went off to do other cat business.
The patterns are a bit rumpled, but fine.