Misty, early morning sunlight is creeping over San Francisco. Now, at 8:15, in Henry Barbour's garden in Seacliff, the rising mist reaches the flagstone walk on which Henry's grandson Pinky was working yesterday, when he strained his back. Pinky is making little flagstones out of big flagstones just now, paying off a debt of $250 to his grandfather. He hasn't arrived for work yet this morning - possibly his back is still bothering him.