Chapter Five: "Rotting Grass Transforms into Fireflies" — The Philosophy of the Rotten Becoming Miraculous

I. A Marvel: How Can Rotting Grass Produce Fireflies$37

The first of Great Heat's three pentads is "rotting grass transforms into fireflies." These four characters record a phenomenon the ancients regarded as nothing short of miraculous — rotting grass gives birth to fireflies.

The Monthly Ordinances records for the month of late summer: "Warm winds arrive; crickets dwell in the walls; young hawks learn to hunt; rotting grass transforms into fireflies." The Lost Zhou Documents (Yi Zhoushu) likewise records: "On the day of Great Heat, rotting grass transforms into fireflies." In the ancients' observation, every year around Great Heat, from amid decaying, spoiled grass, points of firefly light would emerge — and they concluded: fireflies are born by metamorphosis from rotting grass.

From the standpoint of modern biology, fireflies are of course not produced from rotting grass; rather, firefly eggs hatch in decaying vegetation and moist soil, and the larvae mature in damp, decomposing environments before emerging as adults. The ancients observed fireflies rising from rotting grass and inferred direct metamorphosis — a "misunderstanding." But this "misunderstanding" carries within it a system of life-philosophy far more worthy of our contemplation than any correct biological fact.

II. Master Zhuang's "Transformation of Things": All Things Are but the Flow of a Single Vital Breath

To understand "rotting grass transforms into fireflies," the deepest key lies with Master Zhuang (Zhuangzi).

At the end of the "Discussion on Making All Things Equal" (Qiwu Lun), Master Zhuang tells the famous parable of the butterfly dream: "Once Zhuang Zhou dreamed he was a butterfly, flitting and fluttering about, a butterfly enjoying itself … He did not know whether he was Zhou who had dreamed he was a butterfly, or a butterfly dreaming it was Zhou. Between Zhou and the butterfly there must be some distinction. This is called the Transformation of Things."

But Master Zhuang's most astonishing passage on the "Transformation of Things" appears in the Zhile ("Supreme Happiness") chapter: "Seeds have their germs; given water they become … Qingning becomes cheng, cheng becomes horses, horses become humans, and humans return again to the mechanism. All things emerge from the mechanism, and all things return to the mechanism." This passage paints a picture of ceaseless mutual transformation among all things — seeds encountering different conditions metamorphose into different beings, one thing generating another, until all return to the great mechanism of generation.

In Master Zhuang's view, there are no impassable boundaries between things. Grass and insect, death and life, rot and flourishing are merely the flow of a single qi (vital breath) through different forms. The Zhibeiyou ("Knowledge Wandered North") chapter states most transparently: "A person's life is the gathering of qi; when it gathers there is life, when it disperses there is death … Therefore it is said: all under heaven is but a single qi."

If "all under heaven is but a single qi," then rotting grass transforming into fireflies is not in the least surprising. The grass's form disperses, but the qi composing it does not vanish; it merely transmutes into the form of fireflies.

What a luminous vision of life! In this conception, there is no true "death," only "transformation"; no true "disappearance," only "flow." Rotting grass is not an end but the precursor of firefly light; firefly light does not arise from nothing but is the rebirth of rotting grass.

III. The World of Metamorphosis in the Book of Rites and the Huainanzi

The concept of "Transformation of Things" was by no means the view of Master Zhuang alone; it was a widespread cosmological assumption across the pre-Qin and Han periods.

The Monthly Ordinances records numerous instances of metamorphosis as phenological signs: "Hawks transform into doves" (mid-spring), "field mice transform into quail" (late spring), "rotting grass transforms into fireflies" (late summer), "sparrows enter the great waters and become clams" (late autumn), "pheasants enter the great waters and become mirages" (early winter). These "transformations" are recorded calmly, as though they were the most natural occurrences in the world.

Why did the ancients accept such metamorphoses so matter-of-factly$38 Because in their cosmology, all things are ultimately the transformations of a single qi, whose movements cause all things to manifest different forms in different seasons.

IV. The Rotten Becomes the Miraculous: The Dialectic of Light Born from Darkness

The most profoundly stirring aspect of "rotting grass transforms into fireflies" is not merely the metamorphosis of grass into insect, but the breathtaking dialectic it embodies — the most rotten, most dark thing gives birth to the most weightless, most luminous thing.

Picture the scene: rotting grass — foul, corrupted, lifeless, belonging to "death" and "darkness." And fireflies — weightless, glittering, quicksilver-alive, belonging to "life" and "light." The contrast is immense. Yet it is precisely from the foulest darkness that the purest glimmer takes flight.

This is a metaphor of the utmost depth. It tells us: light does not always emerge from light, nor does the miraculous always spring from the beautiful. On the contrary, the deepest light is often nurtured within the deepest darkness, and the most wondrous transformations occur at the site of the most thorough decay.

Master Zhuang has a sentence that shook the world. In the Zhibeiyou, when Dongguozi asks where the Way (Dao) resides, Master Zhuang replies: "In ants … in panic grass … in tiles and potsherds … in excrement and urine." The inquirer is progressively more astonished as Master Zhuang's answers descend ever "lower" — the Way dwells even in the most filthy, most base of things! Master Zhuang's point is that the Way is omnipresent; it does not disdain any vile or lowly thing. Precisely in those things that people despise, the Way's transformative power is most active.

"Rotting grass transforms into fireflies" is the perfect illustration. The Way (the force of generation and transformation) does not disdain the rotting grass's filth and decay; instead, precisely within that decay, it nurtures the firefly's light. This gives us a profound life-wisdom: do not despise what appears rotten, ruined, or hopeless — perhaps precisely within the deepest darkness, an unanticipated new life and light is being born. This is what is meant by "snatching life from the jaws of death," "from the nadir comes the turning," "when Stripping reaches its extreme, Return must follow."

V. Why "Fireflies"$39 The Faintness of the Light and the Afterglow of Fire Virtue

Why is it specifically "fireflies" — a light-bearing insect — that Great Heat engenders, and not something else$40 What is the connection to Great Heat's Fire virtue$41

The defining characteristic of the firefly is "light" — it emits a faint, cool glow in the dark. And Great Heat is the moment of Fire virtue's supreme ascendancy, whose essential characteristics are also "light" and "heat." From this angle, the firefly is a kind of "avatar" or "afterglow" of Fire virtue at its most tenuous.

But note the subtle shift: Great Heat's fire is blazing, searing, belonging to the midday sun — a "great fire." Firefly light is cool, faint, belonging to the dark of night — a "small fire." From the great fire of the blazing sun to the small fire of the firefly, what has happened$42

What has happened is precisely the transformation of "the extreme turns to decline." Though Great Heat is the apex of Fire virtue, the apex is the turning point. From Great Heat onward, the blazing "great fire" is quietly fading, and one of the products of its transformation is these faint "firefly lights." The cool faintness of firefly glow symbolizes Fire virtue's passage from flourishing to decline, from fierce to gentle. The firefly, this tiny creature, assembles in itself the contraries of water and fire, yin and yang, rot and radiance, dark and light — it is itself a miniature cosmos of "yin within yang, light within decay, Fire and Water in balance."