The Channel of Rhythm joins the Sacral centre to the G/Identity centre through Gates 5 and 15, 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 5, Waiting (Xu). Clouds rising toward heaven but not yet raining. It counsels nourishment and patient certainty, the strength that does not force a river crossing before its time.
Hexagram 15, Modesty (Qian). The mountain hidden within the earth. It is the one hexagram in which every single line is favourable: what is high is levelled, what is low is raised, and modesty carried through brings work to completion.
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.