Building a robot that鈥檚 both human-like and useful is a decades-old engineering dream inspired by popular science fiction.
While the latest artificial intelligence craze has sparked another wave of investments in the quest to build a humanoid, most of the current prototypes are clumsy and impractical, looking better in staged performances than in real life. That hasn鈥檛 stopped a handful of startups from keeping at it.
鈥淭he intention is not to start from the beginning and say, 鈥楬ey, we鈥檙e trying to make a robot look like a person,鈥欌�� said Jonathan Hurst, co-founder and chief robot officer at Agility Robotics. 鈥淲e鈥檙e trying to make robots that can operate in human spaces.鈥�
Do we even need humanoids? Hurst makes a point of describing Agility鈥檚 warehouse robot Digit as human-centric, not humanoid, a distinction meant to emphasize what it does over what it鈥檚 trying to be.
What it does, for now, is pick up tote bins and move them. Amazon announced in October it will begin testing Digits for use in its warehouses, and Agility opened an Oregon factory in September to mass produce them.
Digit has a head containing cameras, other sensors and animated eyes, and a torso that essentially works as its engine. It has two arms and two legs, but its legs are more bird-like than human, with an inverted knees appearance that resembles so-called digitigrade animals such as birds, cats and dogs that walk on their toes rather than on flat feet.
Rival robot-makers, like Figure AI, are taking a more purist approach on the idea that only true humanoids can effectively navigate workplaces, homes and a society built for humans. Figure also plans to start with a relatively simple use case, such as in a retail warehouse, but aims for a commercial robot that can be 鈥渋terated on like an iPhone鈥� to perform multiple tasks to take up the work of humans as birth rates decline around the world.
鈥淭here鈥檚 not enough people doing these jobs, so the market鈥檚 massive,鈥� said Figure AI CEO Brett Adcock. 鈥淚f we can just get humanoids to do work that humans are not wanting to do because there鈥檚 a shortfall of humans, we can sell millions of humanoids, billions maybe.鈥�
At the moment, however, Adcock鈥檚 firm doesn鈥檛 have a prototype that鈥檚 ready for market. Founded just over a year ago and after having raised tens of millions of dollars, it recently revealed a of Figure walking through its test facility in Sunnyvale, California.
Tesla CEO Elon Musk is also trying to build a , through the electric car-maker鈥檚 robotics division, but a hyped-up live demonstration last year of the robot鈥檚 awkwardly halting steps didn鈥檛 impress experts in the robotics field. Seemingly farther along is Tesla鈥檚 Austin, Texas-based neighbor Apptronik, which unveiled its Apollo humanoid in an August video demonstration.
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All the attention 鈥� and money 鈥� poured into making ungainly humanoid machines might make the whole enterprise seem like a futile hobby for wealthy technologists, but for some pioneers of legged robots it鈥檚 all about what you learn along the way.
鈥淣ot only about their design and operation, but also about how people respond to them, and about the critical underlying technologies for mobility, dexterity, perception and intelligence,鈥� said Marc Raibert, the co-founder of Boston Dynamics, best known for its dog-like robots named Spot.
Raibert said sometimes the path of development is not along a straight line. Boston Dynamics, now a subsidiary of carmaker Hyundai, experimented with building a humanoid that could handle boxes.
鈥淭hat led to development of a new robot that was not really a humanoid, but had several characteristics of a humanoid,鈥� he said via an emailed message. 鈥淏ut the changes resulted in a new robot that could handle boxes faster, could work longer hours, and could operate in tight spaces, such as a truck. So humanoid research led to a useful non-humanoid robot.鈥�
Some startups aiming for human-like machines focused on improving the dexterity of robotic fingers before trying to get their robots to walk.
Walking is 鈥渘ot the hardest problem to solve in humanoid robotics,鈥� said Geordie Rose, co-founder and CEO of British Columbia, Canada-based startup Sanctuary AI. 鈥淭he hardest problem is the problem of understanding the world and being able to manipulate it with your hands.鈥�
Sanctuary鈥檚 newest and first bipedal robot, Phoenix, can stock shelves, unload delivery vehicles and operate a checkout, early steps toward what Rose sees as a much longer-term goal of getting robots to perceive the physical world to be able to reason about it in a way that resembles intelligence. Like other humanoids, it鈥檚 meant to look endearing, because how it interacts with real people is a big part of its function.
鈥淲e want to be able to provide labor to the world, not just for one thing, but for everybody who needs it,鈥� Rose said. 鈥淭he systems have to be able to think like people. So we could call that artificial general intelligence if you鈥檇 like. But what I mean more specifically is the systems have to be able to understand speech and they need to be able to convert the understanding of speech into action, which will satisfy job roles across the entire economy.鈥�
Agility鈥檚 Digit robot caught Amazon鈥檚 attention because it can walk and also move around in a way that could complement the e-commerce giant鈥檚 existing fleet of vehicle-like robots that move large carts around its vast warehouses.
鈥淭he mobility aspect is more interesting than the actual form,鈥� said Tye Brady, Amazon鈥檚 chief technologist for robotics, after the company showed it off at a media event in Seattle.
Right now, Digit is being tested to help with the repetitive task of picking up and moving empty totes. But just having it there is bound to resurrect some fears about robots taking people鈥檚 jobs, a narrative Amazon is trying to prevent from taking hold.
Agility Robotics co-founder and CEO Damion Shelton said the warehouse robot is 鈥渏ust the first use case鈥� of a new generation of robots he hopes will be embraced rather than feared as they prepare to enter businesses and homes.
鈥淪o in 10, 20 years, you鈥檙e going to see these robots everywhere,鈥� Shelton said. 鈥淔orever more, human- centric robots like that are going to be part of human life. So that鈥檚 pretty exciting.鈥�
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