I decided to do something different this session and started the kids off using a real ball in sound ball. About every 3rd or 4th throw, one of them tossed it back to me.
Today I took the ball away and we played the traditional way - with an invisible ball which not only changed sound but could change size and weight as it passed from person to person.
One of the kids is on the autism spectrum, so I always keep an eye out to make sure he's not being excluded in games. Then I noticed something.
When the ball went invisible, they started to exclude me. Like they didn't need me to be the person who could reliably throw and catch any more.