The use of black and white in the taijitu, or yin–yang symbol, is quite deliberate rather than decorative. Black and white are the most striking visual opposites, so they make the polarity of the two principles immediately apparent, while at the same time suggesting that these opposites belong to a single, unified whole. The stark contrast draws attention to distinction without implying conflict, and it invites contemplation of how difference and unity coexist. In this way, the colors serve as a kind of visual teaching, making the doctrine of complementary duality accessible at a glance.

Within this visual language, black is associated with yin and conveys darkness, night, shade, and the hidden or inward aspect of existence. It is linked with passivity, receptivity, stillness, and rest, as well as cool, moist qualities and an inward, descending movement. This side of the symbol evokes what is subtle, deep, and absorptive, what receives rather than asserts. It points to the quiet, nurturing dimension of reality, which does not force itself into visibility yet underlies and sustains much of what appears.

White, by contrast, is associated with yang and conveys light, day, brightness, and the outward or manifest aspect of existence. It is linked with activity, motion, creativity, and clarity, as well as warmth, dryness, and an expansive, outward movement. This side of the symbol evokes what is expressive, dynamic, and radiant, what brings things into visibility and form. It points to the energetic, initiating dimension of reality, which propels cycles of change and development.

A crucial feature of the symbol is that each half contains a small circle of the opposite color: a white dot within the black field of yin, and a black dot within the white field of yang. This detail shows that nothing is purely yin or purely yang; each always contains the seed of its opposite. Darkness carries within it the possibility of light, and light carries within it the possibility of darkness, so that each quality can transform into the other. The monochrome design thus suggests both clear distinction and deep interpenetration, indicating that these apparent opposites are complementary aspects of one continuous process rather than enemies locked in moral struggle.