The creature in the case
In 1842, P. T. Barnum agreed to exhibit a curiosity acquired by Moses Kimball. The National Park Service describes the piece as an assembly of animal remains, with a monkey-like upper body joined to a fish tail. Barnum presented it as the Feejee Mermaid.
The object was visibly strange, but strangeness alone does not sell a museum ticket. Barnum used advertisements and controversy to give it a place in the public imagination. The visitors came to decide whether they were looking at evidence, a marvel or a very accomplished trick.
The story does part of the work
A British Museum specimen from the same broad tradition shows how often “mermaids” were made by combining a monkey or ape-like upper body with a fish tail. The method was not a single isolated invention. It belonged to a wider culture of cabinets, taxidermy and theatrical display.
The lesson is not that audiences were foolish. They were given an image before they were given a way to verify it. Once the object had a name and a setting, every argument about its authenticity helped keep the event alive.
Before verification catches up
The pattern is familiar in a different medium. In 2026, AFP Factuel identified images claiming to show a police search at X’s Paris offices as AI-generated. The images had already circulated as evidence by the time the verification arrived.
The comparison is limited, but useful. A visual can travel with its explanation attached, and the explanation can set the terms of belief before anyone has checked the source. Barnum understood that the event around an image could be more durable than the image itself.
