Braitenberg's fourteen vehicles, plus a Vehicle 0, as a history of personal productivity
Companion: Wiring the Week, which builds five of these and runs them →Start here
Built in a day at my first Playgroup, with Fable 5.1. The story of the day is on the experiments page.
Valentino Braitenberg (1926–2011) was a neuroanatomist who ran the Max Planck Institute for Biological Cybernetics in Tübingen. In 1984 he published a slim book, Vehicles: Experiments in Synthetic Psychology (MIT Press, 1984), which builds fourteen imaginary machines one part at a time: a sensor wired to a motor; a second pair; a minus sign on the wire; a threshold; a loop; an associative link. Each addition is trivial to build, yet anyone watching the result move about will reach for words like fear, love, logic, ideas, foresight.
That gap is the book's real subject. Braitenberg calls it the law of uphill analysis and downhill invention: it is easy to build behaviour from a mechanism and very hard to guess the mechanism from the behaviour, so we systematically over-estimate what is inside.
Personal productivity tools invite exactly that over-estimation ("it knows what I need"), and they have grown by the same kind of small additions. So the exercise here lines the two up. For each vehicle: which productivity tool added the same part, what it has to be given to work (its sensors and motors), and who is holding the initiative once it has them. The rungs across the top track that last question, from you to the tool's own interest; each is defined in one line under the rung bar. Vehicle 0 is not in the book: it is the rung below the first, added here so the paper era has a place.
Each screen: the mechanism on the left, what it senses and does in the middle, the tools and the trade on the right. Arrow keys step through; the last screen is the critique. The companion page, Wiring the Week, builds five of these vehicles in a small language and runs them over a sample week.
Last screen
Braitenberg's sequence is pedagogical. He never claims that brains, or products, climb it in order, and the history here doesn't either. The vehicle numbers are a vocabulary for asking "what, specifically, is wired?", not a maturity model. The moment it becomes one, someone will sell you a Vehicle 13 sticker.
Vehicles 8 and 9 add perception (a retina, a map, a template); Vehicles 10 to 13 add initiative. A single number can't say which. A location reminder senses a great deal and decides almost nothing; a chat model senses almost nothing (a prompt) and produces a great deal. Access and initiative are separate axes, and the ladder assumes they rise together. The figure plots the same tools on both. The rungs are lumpy for the same reason: five vehicles on rung 1, one each on 2, 3, 6 and 7. They were named from the vehicles, not derived first.
Braitenberg's world is lights and heat sources. Ours is a person who adapts to the tool while the tool adapts to the person: Vehicle 7 learning from you while you learn to game Vehicle 7 is a coupled system with no counterpart in the book. Edwin Hutchins's distributed cognition and Lucy Suchman's situated action are better lenses for that half of the story.
Engagement-optimised apps sit on the top rung here, but their egotism is the vendor's, delegated into the design (Madeleine Akrich's "scripts"), not the artefact's own. On Braitenberg's own terms that is a Vehicle 2 whose wires someone else crossed: a puppet, not an egoist. The new question is agents with standing goals and memory, where the interest starts to become endogenous, and even there it was trained in by someone.
A vehicle never asks permission. A tool's autonomy is also a grant, of mail, calendar, files, money, and most of the pro/con column is really about that grant. Sensors and motors gesture at it; consent, revocation and audit have no wiring diagram at all.
The executive assistant was a Vehicle 13 a century before any scheduling app; Mechanical Turk sat behind many "smart" features; Lilly Irani, and Mary Gray and Siddharth Suri, have documented that "ghost work". A history of tools that leaves out assistants overstates how new delegation is.
The rows are assigned from observed behaviour, because Priority Inbox can't be opened and looked at, which is precisely the fallacy the book warns about. Dates are first public releases and approximate.
The one-part-at-a-time discipline: of any product, ask what was added. It shows that today's agents are a Vehicle 12 (a generative loop) wrapped in a Vehicle 5 harness (thresholds, tool calls, retries), with Vehicle 13 claimed on the box. And it keeps the attribution warning attached to the thing being sold.
Valentino Braitenberg, Vehicles: Experiments in Synthetic Psychology (MIT Press, 1984). Vehicle 0 is an addition; the drawings are stylised, not the book's figures.