This is something I would generally use more when working with children, although that said, can be used with adults if it was felt it might enhance the work during counselling sessions.
Play therapy means that we would use various different materials including sand, farm animals, puppets, paints etc.
In my experience, particularly when working with children, I find that once engrossed in the play or drawing, it serves to relax the client and enables them to talk more freely, often without even really realising they are opening up. I have experienced excellent results with clients when using this in the past.
Rose is waiting for your call and will be happy to talk about this in further detail.