The terrain ahead is divided into a grid of squares, divided further into a number of districts, which, in turn, are divided into sub-districts (which are also sub-divided.) There is no end to this process. Here is a savage and inhospitable cave in flames; there is one corner that is not on fire. It expands endlessly; a maze of corners within corners within corners. Somewhere, unknown to inhabitants of these distant lands, the fire rages.