kiwari 木割 golden ratio
Kiwari is the way to determine the dimensions of the building components with the proportional ratio to another component. The size of the columns and the distance between them were used as the base dimension, and then all the other building components' sizes and positions were defined with the ratio to those two dimensions.
The design based on Kiwari is rational, efficient and it makes constructing a building a lot easier. However, it lacks originality if it is applied to all the buildings. Indeed, the carpenters competed with one another to come up with different techniques and small details that would help add creativity and give the building originality.