The Channel of Concentration joins the Sacral centre to the Root centre through Gates 9 and 52, and both of those numbers are borrowed. They are positions in the King Wen sequence of the I Ching, the Chinese divinatory classic whose sixty-four hexagrams Human Design maps one to one onto the sixty-four gates of its bodygraph. Read as I Ching rather than as Human Design, the two numbers name two independent oracle texts.
Hexagram 9, Small Taming (Xiao Xu). Wind driving across heaven. Dense clouds gather but no rain falls; the time allows only restraint in small matters, influence exercised gently where force is not yet possible.
Hexagram 52, Keeping Still (Gen). The mountain doubled. It is stillness achieved at the right time, the back at rest, movement and rest each in its season.
The I Ching itself never sets these two hexagrams in a pair. Each stands alone in the sequence, consulted about a changing situation and answered in counsel that passes. The pairing is a construction of Ra Uru Hu's system, published from 1987, which fixes each hexagram to a position in a birth chart and reads the joined pair as a lasting trait of the person. The correspondence of number is real, and both hexagrams can be followed into their own entries in this atlas; the pairing, and the character read out of it, belong to the modern system alone.