Yesterday morning, a lawyer-photographer friend and I took a pass on the conference and went walking with our cameras. Heavy fog was beginning to lift. This is the Transamerica Building, SF's pyramid, backlit through the fog by the morning sun. Why does a shadow of the pinnacle appear to be hanging on the cloud behind the building? If there are any meteorologists of optics experts out there, please help us out.Lots of San Francisco pix are going up on Flickr here.