Rigidity

I wonder how to break BJ's rigidity.

He asks for paper and pencils 20 times a day.

He draws Mr Bean every now and then. He's totally fixated with Mr Bean.

I would like him to have a spectrum of interests....like other kids. Or, maybe, enjoying other activities and not only dig soil or pick up sticks at the playground to make fire (pick firewood).

Just wondering how to expand his interests....takes a long time.