Chapter 1 - Workshop on the Edge of Osaka
Summer, 2011. Yuma Kaneda was twenty-two years old, a graduate of a second-tier mechanical engineering program whose name rarely appeared on the recruitment lists of Japan’s major corporations. He worked the night shift at an auto parts factory, fastening the same bolt four thousand times over eight hours, and in the afternoons, in a rented workshop the size of a dorm room, he built a robot leg.
The workshop had once been a bankrupt bicycle shop. Its owner, an old man named Endo, rented it to Yuma cheap because, as he put it, “better the sound of a soldering iron in here than the sound of silence.” Endo never asked what Yuma was building. He simply brought over cold tea every afternoon and sat in the corner, watching, the way one watches a television program that never grows tiresome.
Yuma wasn’t building a humanoid robot that chattered or danced on exhibition stages, the kind that often showed up in tech news. He was building a leg. Just a leg a pair of mechanical limbs that could balance themselves on uneven ground, inspired by the way his grandfather, who had lost a leg in a textile factory in the 1970s, had walked on a wooden prosthetic for forty years without ever complaining.
His grandfather died when Yuma was sixteen. What remained was the wooden prosthetic, kept by his mother in a closet, and a sentence his grandfather used to say often: “An honest leg doesn’t need to be beautiful. It only needs to know where to step, even when the ground isn’t level.”
Yuma had no capital, no connections, and no English fluent enough to read Western robotics journals without a dictionary beside him. What he had were YouTube videos he watched over and over until he’d memorized every second, demo footage from a robotics lab in Boston, and an interview with a startup founder in San Francisco who talked about “building bodies for artificial intelligence” as if it were as simple as building an app.
He wrote to the lab in Boston every month for two years. Fifty-seven emails without a reply. Each time one went unanswered, he saved the draft in a folder named “not yet,” not “failed” a small distinction that mattered to him.
Email fifty-eight, he attached a video: his robot leg absorbing a broom strike from the side, stumbling, then regaining its balance in 0.3 seconds. The footage was shot on a cheap phone, the image blurry, but the motion was honest.
A reply came six hours later. Not from the lab in Boston, from a venture partner who, somehow, had been copied on the email.
“I want to talk to you. Can we do a video call tonight, Japan time?”
Yuma didn’t sleep that night, not out of nerves, but because he spent six hours fixing the lighting in his workshop so it would look decent on screen.
