In 1989, two MIT artificial intelligence researchers made a terrifying prediction. “Within a few years,” wrote Rodney Brooks and Anita Flynn, “it will be possible at modest cost to invade a planet with millions of tiny robots.” Their paper “Fast, Cheap and out of Control: A Robot Invasion of the Solar System,”, argued that small, autonomous “gnat robots” would soon become cheap enough to solve problems en masse.

Nearly three decades later, those millions of tiny robots have yet to take over, at least not exactly like Brooks and Flynn envisioned. While they were right in some ways—the world has more than 700 million active iPhones—the vision of the fast, autonomous, tiny, buzzing bot is still a dream. Fly-sized bots have mastered liftoff, flight, landing, but all while bound to an outside power source. That is, until now.

Sawyer Buckminster Fuller, a mechanical engineering professor from the University of Washington who is not related to the inventor of the geodesic dome, announced on Tuesday that his lab has freed this humming device from the wires that have constrained its range and movements. Instead, the robot has a tiny photovoltaic cell—a mini solar panel—that takes in power from a laser.

Fuller wanted to follow biological principles, which meant deviating from mankind’s most useful invention—the wheel. Most modern electronics, such as the electric engine, rely on some sort of rotary motion. Biology, on the other hand, usually involves more of a undulating pattern. For example, try making a wave with your arms. Next, try to imitate a spinning wheel. Actually, don’t do that, it’s painful. Fuller’s bot has the rapid wing-beating motion of a hummingbird rather than a helicopter.

Though the small scale means that the faux-biological design takes up less power than an equivalent motor, the robot still uses a lot of power. There are no commercially available batteries that produce enough juice to power flight—the batteries for hearing aids are the right size, but too weak, according to Fuller. The laser delivers a higher voltage than what comes out of a US electrical outlet, and only about a quarter of that actually gets to the device. “It’s a pretty inefficient way to get power to the robot, but the robot doesn’t take much power,” says Fuller.