Nine Star Ki lays nine numbers on the Lo Shu grid, each with a fixed position, element and trigram. One White Water sits due north, on the Kan trigram — water running in a deep valley. North is the darkest direction of the year, so One White's subject isn't cold, it's depth: downward, inward, happening where it can't be seen.
It shows up in you like this: you rarely solve things by pushing at them, you look for the gap; you need solitude, and the need gets sharper under pressure; and you read accurately what people didn't say.
Running well, One White is permeation: slow, and it reaches places others can't. Blocked, it becomes isolation — going round so long you can't locate yourself, or holding every feeling inside. The traditional advice for One White has been banks: fixed relationships, fixed hours, fixed places. Water has a shape when it has a container, and scatters when it doesn't.