The tàijítú is the name of the symbol commonly known as “yin/yang.” It is a symbol for the complementary nature of opposites; night defines day, shadow defines light; an inhale isn’t complete without an exhale… All existence can be seen to utilize this seeming duality to for a unified whole.
Also, In non dualistic Shaivism of Kashmir, there is a tradition known as Spanda, which like the material of a similar name, expands & contracts. That is the the universe, like a beating heart, or a piece of metal that expands in the heat and contracts in the cold, or water which does the opposite. It’s very much a yin and yang view of reality.
These pieces are rendered using a zen technique that infuses them with chi (the “ji” in “tàijítú”). They are aproxamately 8×10 in size. They are rendered with gold, purple and sumi ink with a sumi brush on lokta paper; a paper made in the Himalayas from materials indigenous to that region.