This is the 'Map of the Yellow River' (left) and the 'River Lo Writing' (right).

See also Ta Chuan, section I, chapter IX, §§ 1-2, and chapter XI, § 8.

Two alternative arrangements of the trigrams, de 'Primal Arrangement' (left) and the 'Inner World Arrangement' (right).

See also Shuo Kua, chapter II, §§ 3 and 5, for references to these arrangements.