I thought of this yesterday when the kiddos were over for a visit. First they biked and ran down the street, the youngest chuckling in delight as she raced to keep up with the three-year-olds. Next they swarmed inside where they pulled out the toy bins and dug in.
There were doll houses to decorate and jack-in-the-boxes to crank. There were toy trains to zoom across the floor. There were adults nearby, but we tried to fade into the background. Because the kids were losing themselves in the "work" of play — and our job was to leave them alone.