What is the key-in-the-wine story?

Hume retells it from Don Quixote: two of Sancho's kinsmen were asked to judge a hogshead of wine. One found a faint taste of leather, the other of iron, and both were laughed at — until the cask was drained and an old key on a leathern thong was found at the bottom. Their perception was real and verifiable, and that is delicacy.

How do the Delicacy Trials work?

Public-domain and Creative-Commons recordings are damaged on purpose, by a known amount — pitch drift, timing smear and compression damage — and you pick the original and name the flaw. Unlike a taste quiz, the answers are right or wrong, the difficulty is tunable, and the items can be calibrated with item-response theory.

Where do the Delicacy Trials sit in the gym?

They are machine 02, and the door is open. They were built after the Prestige Test, on the principle that a gym leaves its equipment in plain view long before anyone is ready for it. This one is no longer roped off.

HUME'S CRITERIA · DELICACY

Delicacy of taste

Hume anchors delicacy in a story he borrows from Don Quixote. Two of Sancho's kinsmen are asked to judge a hogshead of wine. One tastes leather in it; the other tastes iron. The company ridicules them — the wine is excellent, everyone else agrees. Then the hogshead is drained, and at the bottom lies an old key on a leathern thong.

The point of the story is not that the kinsmen had refined opinions. It's that their perception was verifiable. There was a fact at the bottom of the barrel, and their palates found it while everyone else's missed it. Delicacy, in Hume's account, is exactly this: the capacity to register fine ingredients in a composition that most perceivers never notice — and the key in the wine is what separates delicacy from pretension. A claim of fine taste that can never be checked is just a claim.

Most taste tests never leave opinion territory, which is why they can't measure delicacy at all. The Delicacy Trials are built the other way around: start from recordings in the public domain or under Creative Commons licenses, introduce controlled degradations — pitch drift, timing smear and compression damage — and ask which version is the original and what, precisely, is wrong with the other. Every trial has a key at the bottom of the barrel: an objectively correct answer. Difficulty is tunable, so the trials can find the exact threshold where your ears give out, and the items can be calibrated with item-response theory as real response data accumulates.

In the gym, the Delicacy Trials are machine 02, and they are open — built after the Prestige Test. And where prejudice is something to be caught in the act, delicacy is something Hume says training improves — which is what practice is for.

Questions, answered straight

What is the key-in-the-wine story?: Hume retells it from Don Quixote: two of Sancho's kinsmen were asked to judge a hogshead of wine. One found a faint taste of leather, the other of iron, and both were laughed at — until the cask was drained and an old key on a leathern thong was found at the bottom. Their perception was real and verifiable, and that is delicacy.
How do the Delicacy Trials work?: Public-domain and Creative-Commons recordings are damaged on purpose, by a known amount — pitch drift, timing smear and compression damage — and you pick the original and name the flaw. Unlike a taste quiz, the answers are right or wrong, the difficulty is tunable, and the items can be calibrated with item-response theory.
Where do the Delicacy Trials sit in the gym?: They are machine 02, and the door is open. They were built after the Prestige Test, on the principle that a gym leaves its equipment in plain view long before anyone is ready for it. This one is no longer roped off.