Occasionally DS really, really hits it off with someone else that he meets on the playground that's also close to his own age. It's interesting to see how much more involved his play becomes when this happens.
Today he ran into one of those people, a girl at the park he had been telling me about from last year that I hadn't met yet. It was immediately obvious why they like each other so much. Not only does she go along with his elaborate games, she adds to them as creatively as he does. She is obviously quite bright if not gifted herself.
They have both expressed to me how much they want us to swap phone numbers with each other so that they can play together as often as they can. Now I guess it's up to me to approach her parent and overcome my shyness...