Persuasion takes a form each time it is made: a speech, a brochure, a talk, an email, a letter. The question the laboratory asks is which laws belong to the reader and travel with the sentence, and which belong to the form and stay behind.
One of these four, the email, is what the laboratory has measured so far. The other three are what the laws say should happen, written here as the predictions the next tests will be held to.
PLATE I · THE SPEECH
PREDICTED
You keep the money.
It is spoken, so the drum is heard; it returns as a refrain, and the room hears it come back. The close is the same: an order, then a promise, in the second person, in the future. Keep it. You will.
PLATE II · THE EMAIL
MEASURED
You keep the money.
There is room for one drum strike, one receipt, one ask. The economy runs short. Claims are rare, because there is no space to make them, so the ledger barely opens before it closes.
PLATE III · THE BROCHURE
PREDICTED
You keep the money.
The drum is a headline that repeats on every fold. The receipts are captions. The ask is on the back panel, and it is the only sentence there in the imperative.
PLATE IV · THE TALK
PREDICTED
You keep the money.
Twenty minutes is a few hundred stances. The drum has room to breathe, the receipts arrive as stories, and the close is a vow.
TESTED, NOT ASSUMED
We tested this rather than assumed it. The readings built on long-form pieces were pointed at a large body of email, with the predictions written down first. Speeches and talks are the next probes. One speech has been read so far, as a first look rather than a test: it performed the grammar until it stopped selling. A single speech settles nothing, and the site will say when the test has run.
What travelled.
The drum: one idea, struck and re-struck, in every form. The turn to face the reader at the ask: second person, future tense, wherever a piece asks. The vocabulary of the moves themselves: hope, fear, the sourced sentence, in every form and at every length.
What stayed behind.
The long ramp into the close, the arc of tense across the piece, the cold open (the first minute that has to earn the next ten), the structure of an offer laid out over pages. These are the long form’s laws. A short piece does not break them; it has no room to keep them.
The reading of it.
A law of the reader holds wherever a mind meets a sentence. A law of the form holds where the form gives the law room. The sceptic will say, rightly, that a regularity shared across forms could be a shared convention rather than a law of the reader; telling those apart is the next test. The laboratory publishes both kinds and says which is which.