From JIZAI Body Editing to the Bodyverse:
Behind the Scenes and the Affective Revolution

The last decade of human augmentation has often been told as a story of new wearable devices. I would like to tell a different story: the engineering decisions, constraints, and surprising failures that shaped several “JIZAI” systems, and what those lessons mean now that AI is rapidly changing the role of humans in loops of observation, decision, and intervention.

In the first part, I revisit the development of JIZAI Body projects such as Metalimb, JIZAI Arms, and JIZAI Face through a behind-the-scenes lens. I focus on what we learned when we tried to turn a bold concept into something people can actually wear, control, trust, and socially accept. This includes design trade-offs that rarely appear in papers: where agency really comes from, how embodiment is negotiated, and what it takes to make augmentation robust in everyday contexts rather than only in polished demos.

In the second part, I connect these experiences to a broader shift: AI and the world are increasingly able to run closed loops at scales and speeds that do not require humans to remain at the center. I call this transition Human-out-of-the-loop, not as mere automation, but as a change in where “science,” “control,” and responsibility reside.

At the same time, being out of one dominant loop does not mean being outside loops altogether. We remain inside many overlapping loops in perception, physiology, and emotion. Interfaces and infrastructures can make these loops more legible and negotiable, but they can also make them harder to notice, contest, or exit.

Finally, I propose a new direction that I call an “affective revolution,” and outline the Bodyverse as a guiding policy for designing body-centric systems in this era. The goal is not only to extend capability, but to reframe what we can notice, regulate, and share, when agency is distributed across bodies, environments, and machine-run loops.