The Wall is older than the book where it's featured. Back in the 1990s, when I started the first of the Wise One books, I already had a map.�� It seemed pretty mundane at first. ��Mountains, plains, forest and rivers were all well and good, but I wanted something that helped this map reflect a fantasy world.�� I added the diamonds, thinking each would become a great magical city.�� Then, as I began to formulate the idea of the Wise One homes, each of those diamonds became a castle.�� And a castle