The Rhinoceros Fan
犀牛扇子 — When the Object Is Gone, What Remains of the Name?
The Koan
仰山因一僧参，乃问：「何处来？」僧曰：「天台来。」
仰山曰：「见智者否？」僧曰：「见。」
仰山曰：「智者何似？」僧曰：「不见道解义。」
仰山曰：「汝有犀牛扇子否？」僧曰：「无。」
仰山曰：「既有犀牛扇子，何得言无？」
僧无对。
Yangshan was visited by a monk and asked: "Where do you come from?"
The monk said: "From Tiantai."
Yangshan said: "Did you see Master Zhiyi?" The monk said: "I did."
Yangshan said: "What was Zhiyi like?" The monk said: "He didn't seem to understand the meaning."
Yangshan said: "Do you have a rhinoceros fan?" The monk said: "No."
Yangshan said: "Since you have a rhinoceros fan, why do you say no?"
The monk had no response.
Unpacking the Koan
Yangshan Huiji (仰山慧寂, 807–883) was a student of Guishan and co-founder of the Guiyang school of Chan. His style was sharp and playful, and this exchange is a perfect example.
A monk visits from Tiantai — a major Buddhist center. Yangshan asks about the great Master Zhiyi, and the monk's response is dismissive: "He didn't seem to understand the meaning." This is either arrogance or Chan provocation. Either way, Yangshan pivots to something completely unexpected: "Do you have a rhinoceros fan?"
The "rhinoceros fan" (犀牛扇子) was a fan made with rhinoceros horn — a luxury item. The monk says he doesn't have one. And Yangshan traps him: "Since you have one, why say no?"
The logic is absurd — and deliberately so. The monk says "no," and Yangshan says "yes you do." This isn't about a physical fan. It's about the relationship between absence and presence. The monk denies having the fan, but the moment he denies it, the fan is present in his mind — he's thinking about it. The name "rhinoceros fan" has conjured the thing. And if the thing is present in mind, can you truly say you don't have it?
This is Chan's deconstruction of the name-reality relationship: naming something makes it present, even when the thing itself is absent. And if that's true, what does it mean to "have" or "not have" anything?
Why It Matters
This koan attacks the most basic categories we use to navigate reality: having and not-having, presence and absence, name and thing. In Chan, these categories are not as solid as they seem.
The monk's mistake is answering literally. He thinks Yangshan is asking about a physical fan. But Yangshan is asking about the concept — and the concept is already present the moment it's mentioned. You can't think about a rhinoceros fan without having it, in some sense. The name creates the presence.
This has profound implications for practice. When you try to "let go" of something — a thought, a desire, an attachment — you're still holding it. The very act of trying to release it confirms its presence. Chan's solution is not to let go harder, but to see that the thing you're holding was never a thing to begin with.
Practice Pointer
Try this: don't think of a rhinoceros fan. Now — do you have one? The moment you try not to think of it, it's already there. This is the trap of all "letting go" practices. Instead of trying to release, just notice: is the thing you're trying to release actually there? If you look carefully, can you find it?