A Tangle of Staples Has No Plan — Yet It Decides to Be Strong
June 21, 2026 · M. Mitchell Waldrop, Complexity~5 min read
Empty a box of office staples onto a table and you get a useless little heap. So why does a pile of staple-shaped grains, when it is just tangled together, behave like a material that holds its shape — and then, on cue, dissolve like sand?
The finding, stripped of the hype
Here is the news with the breathlessness removed. A team at the University of Colorado Boulder — François Barthelat and his students Youhan Sohn and Saeed Pezeshki — reported in the Journal of Applied Physics on June 15, 2026, that particles shaped like tiny two-legged staples can hook their bent legs through one another and form what they call an "entangled material." No glue. No weaving. No scaffold. Just shape and crowding. The pile is genuinely strong and tough — it resists being pulled apart — and yet it has a second, stranger trick: gentle vibration coaxes the particles to interlock and grow stronger, while harder vibration makes the whole network unravel in seconds. Concrete that pours back into sand when you shake it. I want to be careful here: these are lab demonstrations of a behavior, not a finished building material, and the team is upfront that recyclable structures and swarm-robot uses are hopes, not results.
Where, exactly, does the strength live?
Now the question that should nag at you. Pick up one staple. Is it strong? No — it bends in your fingers. Is it "reversible"? The word doesn't even apply to a single bent wire; reversibility is a property of how a thing assembles and comes apart, and one staple assembles into nothing. So point to the staple that holds the strength. You can't. The strength is not in any particle. It is in the relationships between them — in the thousands of little hooks each leg makes with its neighbors. This is the idea M. Mitchell Waldrop spends a whole book chasing in Complexity, and it has a deceptively plain name: emergence. The motto the Santa Fe scientists kept repeating was "more is different." Not more of the same — different in kind. A property appears at the level of the crowd that has no meaning at the level of the individual.
How the whole gains properties no part has: in lab tests at CU Boulder (Journal of Applied Physics, June 15, 2026), staple-shaped particles whose two bent legs thread through their neighbors’ legs formed an entangled material that is strong yet comes apart on demand — gentle vibration strengthens it, stronger vibration unravels it. No glue, no weave. Lens: M. Mitchell Waldrop, Complexity (emergence — “more is different”). Schematic of a reported finding, not measured values.
The simple rule that does all the work
What makes this such a clean example is that the "rule" each particle follows is almost insultingly simple: be a bent shape, and tangle with whoever is nearby. There is no foreman counting hooks, no chemistry choosing partners, no master blueprint of where each staple should sit. Each grain only ever interacts locally — with the few neighbors its legs can reach. And out of nothing but that local hooking, repeated across a whole crowd, comes a global behavior: a solid that flows on demand. This is the spine of complexity science. Stop asking "who is in charge of the strength?" — because nobody is. Ask instead: what simple local interaction, repeated enough times, would produce this? The order is not imposed from the top; it grows from the bottom. Waldrop's scientists found the same shape of answer in brains, ant colonies, immune systems, and markets — many simple agents, no controller, a coherent whole nobody designed.
What is real here, and what is still a hope
Let me hold the honest line, because wonder without rigor is just hype. What has been observed is specific and modest: in the lab, staple-shaped particles tangle into a material that is measurably strong, and vibration tunes it stiffer or looser. That is the result. What is still inferred and hoped is everything downstream — recyclable buildings that you shake apart and reuse, reconfigurable structures, robot swarms that bind and release on command. Those are extrapolations the researchers themselves flag as future possibilities, not findings. Emergence is genuinely thrilling, and that is exactly why it needs a guardrail: it is easy to let a striking lab demo balloon into "they've reinvented construction." They have shown a principle. Whether it scales into bridges or shape-shifting robots is an open, testable question — and saying "not yet" out loud is not a buzzkill, it is what keeps the wonder honest.
Why this changes how you see almost everything
Here is the gift you can carry out of a box of staples. Once you really feel emergence, you start seeing it everywhere — and you stop making a certain mistake. When something complex works — a flock that wheels as one, a city that feeds itself, a brain that thinks, a price that finds its level — your instinct is to hunt for the part that contains the magic: the lead bird, the central planner, the "consciousness neuron." The staples whisper that you may be looking in the wrong place. The magic often isn't in any part. It is in the pattern of simple relationships between the parts — which means it can appear with no designer, no blueprint, and no one in charge. That is a humbler and far more interesting picture of the world: strength, life, even thought may be less like a machine someone built and more like a tangle that, given enough simple parts following simple rules, decides to hold together.
No single staple is strong, and none is reversible — both properties belong only to the crowd. The whole, it turns out, can be more than, and different from, the sum of its parts.
Stop hunting for the part that holds the magic. The magic is in how the parts hold each other.
Sources: University of Colorado Boulder (François Barthelat, Youhan Sohn, Saeed Pezeshki), "Combined Effects of Particle Geometry and Applied Vibrations on the Mechanics and Strength of Entangled Materials," Journal of Applied Physics 139(14), June 15, 2026; CU Boulder / EurekAlert! press materials; ScienceDaily report (June 2026). Framework paraphrased from M. Mitchell Waldrop, Complexity. Note: this piece describes an observed laboratory behavior; recyclable buildings, reconfigurable structures, and swarm-robotics uses are the researchers' stated future hopes, not demonstrated results.
さあ、あなたを引っかけるはずの問いだ。針を一本つまみ上げる。それは強いか。いや——指の間で曲がる。それは「可逆」か。その語は一本の曲がった針には当てはまりもしない。可逆とは「あるものがどう組み上がり、どう崩れるか」の性質で、針一本は何にも組み上がらない。では、「強さ」が宿る針を一本、指してほしい。指せない。強さはどの粒子の「中」にも無い。それは粒子どうしの関係の中にある——各脚が隣と作る、何千もの小さな引っ掛かりの中に。これこそ、M・ミッチェル・ワールドロップが『複雑系』一冊を費やして追いかける考えであり、それは拍子抜けするほど素朴な名を持つ。創発だ。サンタフェの科学者たちが繰り返した標語は「多ければ違う(more is different)」。同じものが増えるのではなく、種類として違う。「群れ」の階層に、ある性質が現れる——それは「一個」の階層では意味すら成さないのに。