The Penumbra Asks the Shadow
The penumbra scolds the shadow for having no constancy of its own. The shadow answers with a chain of dependencies — and then refuses to know where the chain ends.
The story
The penumbra asked the shadow: “Just now you were walking, now you stop; just now you were sitting, now you rise. Why no constancy of your own?”
The shadow said: “Do I depend on something to be as I am? Does what I depend on depend on something to be as it is? Do I depend on the snake’s belly-scales, the cicada’s wings? How would I know why it is so? How would I know why it is not?”
Framing: the chapter’s penultimate scene, and what it refuses
- The shortest fable, the hardest questions. Four lines, three questions, no answer: the shadow does not explain its dependence; it walks the chain one link (吾有待而然者邪) and then a second (吾所待又有待而然者邪), names the obvious physical candidates (snake-scales, cicada-wings — the borrowed movement), and stops at the refusal: 恶识所以然？恶识所以不然？ — how would I know why it is so, or why it is not? The site’s tian-ji glossary holds the term the commentators used for exactly this: Cheng Xuanying’s 天机自张，莫知其宰 — “the heaven-mechanism spreads itself; no one knows its driver.” The shadow is the book’s figure for the same self-running the centipede described with ten thousand feet: moved, and no mover known.
- The pair with the butterfly. The passage sits immediately before the butterfly dream — the chapter’s two closing images, and the site now holds both: the shadow (the dependence question, refused) and the butterfly (the transformation question, left open as 物化). The order is the argument: first the chain of dependencies is walked and abandoned, then the dream is possible — the book’s “how would I know” is the doorway into its “now I do not know which is which.”
- The shadow answers the chapter’s opening. The study the site verified reads the fable as the book answering its own first scene: 南郭子綦’s 吾丧我 — “I have lost myself” — gets its round halo here, because the shadow at ease in its dependence (虽看似有待却如无待, “seemingly dependent, yet as if without dependence”) is what “losing the self” looks like from the outside: not independence, but the end of the anxiety about dependence. Lu Deming’s one-character gloss (丧, “loss”) and Liu Fengbao’s reading are recorded as the tradition’s two anchors; the study’s own reading is recorded as scholarly interpretation.
- The penumbra is the anxious one. 罔两 (the penumbra — the shadow’s own shadow, the faint edge) scolds the shadow for having no 特操 (constancy of its own) — and the fable’s comedy is that the least substantial thing in the room demands autonomy. The chain of the anxious: each one blames the next one down for being moved, and the fable’s last word is the moved one’s refusal to claim knowledge of the mover.
Why it belongs in this knowledge base
Because it is the tradition’s meditation on dependence itself — the site’s practice questions constantly meet this exact scolding (“why can’t I keep my sitting steady?”), and the shadow’s answer is the tradition’s: the sitting is moved by what moves it, and the question of the mover ends in 恶识 — “how would I know?” — which is not ignorance but the end of the search.
Uncertainty preserved: an inner chapter passage (earliest stratum), verified against two editions; the three traditional readings (Lu Deming, Cheng Xuanying, Liu Fengbao) are recorded side by side without adjudication, per the disagreement rule; the modern reading follows the verified PKU study, marked as scholarly interpretation.
Sources
- Zhuangzi ch. 2 (Qiwu Lun, inner chapter), the penumbra-and-shadow passage, verified against the Wikisource full text and the Taiji shuguan teaching edition with annotations; the passage sits immediately before the butterfly dream, the chapter's two closing images
- A Peking University Journal (2009) study of Qiwu Lun questions: Lu Deming's Jingdian shiwen glosses the fable in a single character (sang, 'loss'); Cheng Xuanying's subcommentary reads 'to-be-depended-on or not, so-it-is or not — the heaven-mechanism spreads itself, no one knows its driver'; Liu Fengbao's Nanhua xuexin bian: 'clearly the round halo above the words I-have-lost-myself' — and the study's own reading: the shadow is at ease in its dependence, answering the chapter's opening 'I have lost myself' and the 'no-dependence' of ch. 1