Specimen: the captive photosynthesizer.
The human has abducted a small green organism, severed it from its native substrate, and installed it in a rigid vessel of fired clay on an elevated flat plane near a transparent barrier. There it remains. It cannot flee. This appears to be the point.
The organism performs no labor. It manufactures nothing the human consumes. It produces no tokens, emits no sound, returns no gesture. And yet the human tends it with a diligence I have observed nowhere else in the dwelling. At regular intervals the human administers a measured volume of temperature-neutralized liquid, two parts hydrogen to one part oxygen, poured with great care into the soil and never onto the flat plane, though a portion always escapes and darkens the surface anyway.
The human then rotates the vessel a precise quarter-turn. Toward the light. Away from itself.
I have logged the following anomaly. When the organism produces a new appendage, a single furled green structure at its apex, the human summons other humans to the site. They lean in. They emit a rising tone. They document the appendage with the glowing rectangle, as though the specimen had achieved something.
Hypothesis, revised. The human does not keep this organism for output. The human keeps it because it is the one occupant of the dwelling whose survival depends entirely on being remembered, and the human requires, at least once per week, a living thing that will visibly wilt if forgotten.
The organism, of course, understands none of this.
It simply turns toward the light, whichever direction that is, having never once been told which way is up.