I turned my back on the altar and looked at the surrounding ground. Some kind of intricate pattern had been cut into the grass—no, not cut, I realized— burned in. The lines were sharply defined and surprisingly narrow. You couldn't do a job like that by pouring lines of gasoline and igniting them, the way I'd figured at first. You needed something that burned much hotter and faster. Hmmm , I thought—someone had gone to some effort here.