The cosmological cycle
The cosmological cycle: an alternative model for organ relationships
Five Elements theory is not the only system TCM uses to describe relationships between the organs. Alongside the classical Sheng and Ko cycles, there is an older, alternative model: the cosmological cycle. This system does not arrange the elements in a circle but on a vertical axis, with Earth as the central anchor point. Although the relationships in this model differ, it is still widely used in clinical TCM practice today — and for some relationships it is even the most clinically relevant model.
A different view of organ relationships
In the cosmological cycle, the most striking departure from classical Five Elements theory is the relationship between Heart and Spleen. In the standard Sheng cycle, the Heart (Fire) nourishes the Spleen (Earth) — Fire warms Earth. But in clinical practice something different is seen: it is the Spleen that supports the Heart, not the other way around. The Spleen produces Gu Qi from food, which is subsequently transformed into Blood by the Heart. The Heart needs this Blood to anchor the Shen. Without a strong Spleen, the Heart lacks a sufficient material basis for its functions.
This is not a theoretical nuance — it has direct clinical consequences. In Heart Qi Deficiency or Heart Blood Deficiency, strengthening the Spleen and Stomach is one of the first therapeutic steps: the Spleen produces more Gu Qi, the Heart is better nourished, and the Shen is anchored more strongly. The cosmological cycle emphasises this relationship in a way the standard Five Elements circle does not.
Earth as the centre of everything
In the cosmological cycle, Earth — the Spleen and Stomach — stands in the centre. The other elements are arranged around this centre. This reflects a fundamental insight already expressed by Li Dong Yuan in his famous work Pi Wei Lun (Discussion of the Stomach and Spleen, 1249): the Stomach and Spleen are the centre of human physiology, the source of all post-heaven energy, and the basis of tonification for all other organs. Whoever strengthens the Spleen and Stomach indirectly strengthens the whole body.
The cosmological cycle emphasises two aspects that the classical circular arrangement makes less visible: the importance of Pre-Heaven Qi (Water as the basis of everything) and the importance of Post-Heaven Qi (Earth as the centre and source of nourishment). On the vertical axis of the cosmological cycle, Water (Kidney) is at the bottom — the deepest and most fundamental reserve — while Fire (Heart) is at the top — the most immaterial, conscious expression of life. Earth stands in the middle, as the connecting force that transforms earthly food energy into the energy that nourishes the Heart and makes the Shen possible.
Clinical relevance
In practice, the cosmological cycle is used particularly for the central axis: Kidney-Spleen-Heart. The Kidney warms the Spleen with its Yang energy; the Spleen nourishes the Heart with Gu Qi and Blood; the Heart houses the Shen. This triad — the Three Treasures in their organ assignment — is the most fundamental therapeutic circuit in TCM. Whoever keeps these three organs in balance preserves the foundation of life.