The bookman, April (1896) - poster
The pattern
This still is filed under Demonstration ad.
Define
The product does the arguing. The viewer sees the thing work, not a slogan about the thing working.
Mechanism
Proof by performance. The claim is the action: a visible, testable result the reader can replay.
Verdict
We can show a result in seconds
Why it works
The poster is a transaction rather than a portrait: two figures, an exchange caught mid-motion, and the product physically crossing the counter. Turning the customer's back to us makes her a stand-in rather than a character, so the viewer occupies the buying position instead of watching someone else buy. Everything incidental is grey, the counter, the drifts of print, the shopfront, while only the masthead, the awning stripes, the copy in the seller's hand and the month are red, giving the eye a three-point route through the picture. The drawn placard smuggles in flat copy a poster normally cannot carry: what it is, how often it appears, where it comes from and what it costs.
Steal this when
Use this when the friction is the buying moment itself, when people know the product but not that it is out or where to get it. Draw the purchase happening from behind the buyer, and hide the specifications inside the scene on a sign so the poster stays a picture.