The Yin Yang

The Taijitu ("diagram of the supreme ultimate") is a circle divided by a single continuous S-curve into two interlocking, teardrop-shaped halves — one conventionally dark (yin) and one light (yang). Crucially, each half contains a small circle of the opposite shade near its widest point: a dot of light within the dark half, and a dot of dark within the light half.

The S-curve division is the entire point of the design. A circle split by a straight vertical or horizontal line would represent two separate, static halves. The curved boundary instead suggests continuous motion and mutual transformation — each half appears to be flowing into, chasing, or becoming the other, rather than standing permanently opposed to it.

The underlying concept of yin and yang as complementary cosmic forces is genuinely ancient, appearing in Chinese philosophical texts many centuries before the familiar circular diagram existed — early references appear in works associated with Warring States and Han dynasty cosmology, describing shade and light, passivity and activity, as fundamental categories underlying the natural world.

The specific circular Taijitu most people picture today, however, is a considerably later development. It is most closely associated with the Song dynasty Neo-Confucian philosopher Zhou Dunyi (1017–1073 CE), whose short treatise Taijitu Shuo ("Explanation of the Diagram of the Supreme Ultimate") laid out a cosmological sequence from Wuji (the Limitless) to Taiji (the Supreme Ultimate) to the differentiation of yin and yang and the subsequent generation of the Five Phases and the ten thousand things. The now-familiar interlocking swirl design was refined and popularised over the centuries that followed, becoming the standard visual shorthand for yin-yang cosmology across later Taoist and Neo-Confucian thought.

The Yin Yang supports several layers of meaning, all consistent with each other, ranging from the everyday to the deeply cosmological.

Carl Jung, who wrote the foreword to Richard Wilhelm's influential translation of the I Ching, found in Chinese yin-yang thought a striking parallel to his own theory of psychological integration. The dot of the opposite colour within each half maps closely onto Jung's concept of the shadow — the disowned or unacknowledged qualities that persist within even a strongly one-sided personality. A person who over-identifies with active, "yang" qualities (assertiveness, control, outward striving) still carries an unacknowledged "yin" seed — the need for rest, receptivity and surrender — whether or not they consciously recognise it.

Individuation, in Jungian terms, is not the elimination of one quality in favour of its opposite, but something closer to the Taijitu's own logic: an increasingly conscious, dynamic relationship between opposing tendencies, each given its due rather than one being repressed entirely.