A handful of office supplies don’t look like the raw material of tomorrow’s engineering revolution. However, compact them into a dense pile and something extraordinary happens: the bundle begins to behave less like a collection of separate objects and more like a coherent material. Detach and resist. Shake it just the right way and the mass suddenly breaks free, turning back into individual pieces. Engineers at the University of Colorado Boulder have turned that everyday wonder into a serious material question: can geometry alone create substances that are strong, adaptable, and reversible?
The answer, so far, seems to be a hesitant ‘yes’. The Colorado team has been studying “entangled” particles – small components that are mechanically linked to each other rather than glued, welded or chemically bonded. Their work suggests that the shape of a particle can transform a loosely granular material into something with an unusual combination of tensile strength, stretch and resistance. In simulations and physical “pickup” tests.the researchers found that a simple two-legged particle, shaped rather like a staple, produced particularly strong entanglement behavior. Change the geometry of the particles and the bulk material also changes its character.
Increase in traction loads
This is significant because common granular materials such as sand are excellent in compression but significantly poor in tension. Grains of sand can be pressed against each other, but they do not bond well together. Particles as the main matter react in a similar way. Modeling by the Colorado group shows that the tensile loads in these entangled materials are carried through a small number of dynamic force chains, which continually break and reform as the structure is stressed. In other words, the material is not rigid in the traditional sense. It’s more like a constantly renegotiated truce between lots of little hooks. This gives it a curious dual nature: it can be resilient and sustaining, yet still capable of reconfiguration.
The most intriguing feature may be that the material can be switched between more solid and more liquid-like states using vibrations. Gentle mechanical agitation can induce the particles to settle into a tighter entanglement, while stronger or otherwise tuned vibrations can cause the structure to break up. This puts the material in an interesting category between conventional solids and loose grains. It is not a liquid, but it is not a stationary solid either. Instead, it is a mechanically programmable assembly, with properties that depend on the history, motion, and architecture of the particles.
Creating a sustainable construction industry
The obvious question is what could such material be good for? One possibility is sustainable construction. Imagine temporary walls, arches, or shelters assembled from entangled particles that can later be disassembled without damage and reused in a different form. Another is impact management, where a structure may need to be rigid in one situation and energy-dissipating in another. There is also a robot corner. The Colorado researchers themselves have raised the possibility that many small units could one day be locked together to perform a task and then split up again when it’s done—an idea that sounds theatrical, but that sits squarely within some active areas of engineering research.
This broader context is where Canadian research becomes particularly important. At McGill Universityresearchers working on architected metamaterials have developed shape-shifting structures inspired by kirigami and origami. In a 2025 breakthrough, the team showed how carefully designed incisions and internal geometries can produce metamaterials that morph into a variety of stable shapes rather than simply stretching uniformly. The same group has also highlighted applications involving deployable structures, soft robotics and adaptive mechanical systems. The common theme with the Colorado staples is that function is being engineered shape and arrangementnot simply through the chemistry of the base material.
McGill’s work goes even further. Publications from Damiano Pasini’s group describe “entangled multistable origami” with reprogrammable stiffness stiffening and damping, as well as curved origami shells with reprogrammable stiffness. These are different systems from the core-like particles, but philosophically they belong to the same family: materials designed to move between states, store mechanical information, and change behavior under controlled loading. Together they suggest that the future of materials science may involve making matter less static and more computational – built not just to withstand loads, but to respond, adapt and transform.
Canadian Robotics Association
Canada is also active on the robotics side of the equation. The University of Toronto has long work in swarm roboticsincluding its mROBerTO modular platform for studying collective behavior in many small robots. Of the university The Microrobotics Lab is pushing similar ideas on a much smaller scale, developing miniature wireless robots for manufacturing and medical applications. These aren’t groundbreaking materials, but they do show that the notion of many simple units combining into a larger useful system is already an engineering reality. The leap from “bot herd” to “material groups” is no longer a purely speculative step.
There is even a particularly close Canadian parallel in granular behavior. or McGill’s recent thesis examined how Dry granular materials can be flowed locally using vibration for robotic applications, including adaptive manipulation. That work touches the same conceptual nerve as the Colorado study: how can a material be made that goes, on demand, from lock and hold to mobile and easily reconfigured? Such switching behavior is essential for soft grasping, motion, and morphing devices and provides a reliable bridge between basic granular physics and future machines.
None of this means that cities will soon be built from giant boxes of smart elements. Scaling, production, fatigue, control and long-term reliability remain key challenges. But the larger message is harder to dismiss. Materials science is moving beyond the idea that a material should have only one fixed identity. The most compelling prospect is matter that can be assembled, strengthened, softened, reshaped and reused by design. In that sense, the humble staple may have pointed researchers toward something bigger: a world in which materials behave less like passive substances and more like systems with options.
