Mathematics

He broke the news to them, and set them about a new task. Using the dirt that had mounted up, they began building a wall of mud about the perimeter of the field, as they normally would. It had worked out well, because now they had the material required to do such a thing.

In fact, some of the workers suggested Gengyo had planned this from the start, but in truth, he had been so focused on the problem of getting water to the field, he had put the process of creating a wall out of his mind.

With them now focused on their new task, he began to focus on his. He needed the circle of the water wheel to be perfect, else there was no chance of the system working. There was a simple way to create a perfect circle, but he dared not do it on wood straight away.