A groundbreaking robot being developed at Duke University is almost ready to face the world—in any direction. Named Argus after the mythological many-eyed giant, this innovative machine features 20 telescoping legs radiating from a central core, each equipped with depth-sensing cameras. With no designated front, back, top, or bottom, it can see and move in any direction instantaneously.
Instead of mimicking symmetrical shapes found in nature, such as humanoid or dog-like robots, engineering professor Boyuan Chen and his team focused on uniformity in action, a concept they call “dynamic symmetry.” This design principle prioritizes the ability to accelerate uniformly in all directions over traditional anatomical symmetry.
“Instead of measuring how your legs are arranged around a different part of your body, we’re measuring how fast you can move in any direction,” Chen explained. “Who said, you know, if you have a robot to help us in a most effective way, it has to look like us?”
In experiments, Argus has demonstrated remarkable capabilities, navigating sandy beaches, forest undergrowth, and rolling over obstacles. It can stabilize itself after being pushed and even climb between parallel brick walls by alternating bracing and thrusting motions with its legs. Remarkably, if one or more motors fail or a leg breaks, it continues to function effectively.
“Watching Argus move is unlike watching any other robot we’ve worked with,” said Jiaxun Liu, a graduate student and co-author of a study published online Wednesday in the journal Science Robotics. “The first time we saw it navigate among trees and rough terrain, even under heavy collisions, we knew this was something different.”
As part of their research, the team developed a new design principle called dynamic isotropy, which rates robots on a scale of 0 to 1 based on how uniformly they can accelerate in every direction. Most current robots, including humanoids and drones, score below 0.6. Argus achieves an impressive 0.91.
“When a robot can accelerate equally well in every direction, it stops needing to face the world in any particular way,” Chen said. He hopes this principle could guide the development of search and rescue robots, underwater or aerial vehicles, or robots with the ability to grip objects.
“Instead of building a robot hand that looks like a human hand … one idea is to think about having Argus be the hand itself, and it can manipulate objects in any direction,” he added. “The knowledge we can transfer to the rest of the world is much more deeper than building an existing robot or copying an existing species.”
