A comfy sofa, a place to curl up and sleep.. But my cat loves boxes. Open or closed. If it’s made of cardboard he will lie on it or sleep in it! Forget cat beds, I’ve got three or four, but apart from one very enclosed covered over one he would rather sleep on a box.
I’m expecting a bit of rivalry though, the space next to this box has a towel on it that my other boy cat has been sleeping on. When he comes in I will see what happens.