The Channel of Logic joins the Ajna centre to the Head centre through Gates 4 and 63, 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 4, Youthful Folly (Meng). A spring welling up at the foot of the mountain. It concerns the inexperienced pupil, and its judgment is famous for its reversal: it is not the teacher who seeks the young fool, but the young fool who must seek the teacher.
Hexagram 63, After Completion (Ji Ji). Water over fire, every line in its proper place. It is order achieved, the moment after the crossing, and the vigilance owed to the disorder already beginning at the edges.
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.