The Channel of The Wavelength joins the Throat centre to the Spleen centre through Gates 16 and 48, 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 16, Enthusiasm (Yu). Thunder breaking out of the earth. It is readiness and accord, the movement that meets no resistance, the principle by which music was made and helpers and armies are set in motion.
Hexagram 48, The Well (Jing). Water drawn up through wood. The town may be moved, but the well cannot be moved; it is the unchanging source, spoiled only when the rope falls short or the jug breaks.
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.