This is Jamie's current best toy - an empty nappy box.
He needs help getting in and out of it, but he can communicate that. He can also make clear to us which toys or books he wants to have in the box with him. He laughs his head off if you slide him around the floor in the box, but enjoys just sitting in it too, occasionally trying to fold the flaps shut around himself. Carrying it around the room is another box function, and wearing it as a hat, and encouraging others to wear it as a hat. Plus of course the infinite joys of putting Things into it and taking them out again.
It's a beautiful thing, if a little unhelpful at the time of year when people ask "so what is he into?"