The original note, as written at the time
Imagine an inertia-less chamber in a moving vessel like a car or ship. A chamber equipped with gyroscopes and computer controlled bearings that can offset the moving vessel’s inertia so that the people inside continue doing whatever they are doing — whether writing or drawing — without any abrupt hindrance or vibrations.
Ongoing development
An inertia-less chamber inside a moving vessel — a car or a ship — equipped with gyroscopes and computer-controlled bearings that offset the vessel’s motion, so that the people inside can keep doing whatever they are doing, writing or drawing, without interruption or vibration.
The use is not comfort. It is the recovery of productive time in a place where nothing productive currently happens.
A vehicle is a place where a certain kind of work is impossible. Not because of the seat, but because of the jitter — a hand cannot draw on a moving bus, and a screen cannot be read when the whole frame is vibrating. If the chamber holds still relative to the world, the vehicle becomes an office with a view.
The engineering is real and it is not small. To cancel motion you need to sense it and move the floor against it, which means actuators, travel, and power. A chamber can cancel vibration and small accelerations cheaply; it cannot cancel a pothole without a range of movement that would make the cabin enormous.
So the honest version is a constrained one: a suspended floor with perhaps ten centimetres of travel, cancelling the high-frequency shake and the road buzz, which is exactly what ruins handwriting and reading. It would not make a crash comfortable, and it should not try.
There is a nice inversion in it. We spend enormous effort making vehicles faster, and almost none making them usable. A vehicle that gave you back the hour it takes is worth more than one that saves you ten minutes.
Stillness is the luxury, not speed.