Picture it, said Arne-Sayles, like rainwater lying on a field. The next day the field is dry. Where has the rainwater gone? Some has evaporated into the air. Some has been drunk by plants and animals. But some has seeped down into the earth. This happens over and over again. For decades, centuries, millennia, the water, seeping down, makes a crack in the rock under the earth; then it wears the crack into a hole; then it wears the hole into a cave entrance – a kind of door in fact. Beyond the door the water keeps flowing and it hollows out caverns and carves out pillars. Somewhere, said
...more
