Harvard's TERMES robots build castles with no blueprint — just termite-style cues

A team at Harvard University's Self-Organizing Systems Research Group built a herd of construction robots the size of your head that can raise structures without intricate plans or blueprints — work described in Science and reported by WIRED in February 2014. Graduate student Kirstin Petersen and staff scientist Justin Werfel, inspired by termite mounds in Namibia, called the approach TERMES.

The principle is stigmergy, conceived in 1959 by a French biologist to describe how termite colonies self-organize: each termite scoops mudballs, deposits them, and leaves chemical cues that steer where the others build. No termite follows a blueprint; all know the finished product and what to attend to along the way. The robots run the same loop with bricks — where a robot places its brick depends on what the other bots have already done and what the final structure is supposed to be.

Minimalism is the point: the robots' whole repertoire is moving forward, backward, rotating, climbing, sensing, and picking up or depositing bricks. From that, the fleet built a variety of structures, including castles and pyramids. The WIRED piece notes humans already run one stigmergic construction project at scale: Wikipedia, where contributors lay down 'mudballs of wisdom' that cohere into an interconnected network.

It removes the most fragile component of multi-robot construction — the central plan and planner — by letting the built structure carry the information.

Termites were the proof of concept: the same rules scale from insects to 8-foot air-conditioned mounds oriented along the magnetic axis.

Each robot needs only local sensing and five or six primitive actions, so the fleet tolerates individual failures with no loss of the build.

Coordination doesn't require a plan in anyone's head: if every agent can read the shared artefact, the structure itself carries the instructions — as Wikipedia already shows.

The work was published in Science in February 2014 and demonstrated live on video building castles and pyramids; WIRED framed it as a new army of termite-inspired builders.