Chapter forty two of the Tao Te Ching states the tradition's clearest account of how multiplicity arises from unity. The Tao produces the One, the One produces the Two, the Two produces the Three, and the Three produces the ten thousand things, the text's phrase for everything that exists. Each of the ten thousand things is then said to carry yin on its back and embrace yang in its arms, blending these two forces through moving qi to reach harmony. Commentators across the centuries have read the sequence's middle terms differently. Some identify the Two directly with yin and yang themselves, so the One is undifferentiated unity, the Two is polarity, and the Three is the interaction of yin, yang and the qi that mediates between them. Others read One, Two and Three as stages of increasing differentiation without assigning fixed content to each step, treating the verse as a template for how any complex order unfolds from a single source rather than as a literal list of intermediate beings. What both readings share is the passage's larger claim, that the world's variety is not opposed to the Tao's unity but is its direct and orderly outgrowth, so yin and yang appear in the verse not as a separate doctrine but as the mechanism by which the one Tao becomes the many things.