An origami robot that crawls without electronics. Liu, Mehta, and Yan (arXiv: 2603.23666) build a mechanical oscillator that generates four square-wave signals, each a quarter-cycle out of phase. These four signals drive the robot's origami limbs through four distinct states in sequence — a complete locomotion cycle produced entirely by mechanical timing.
No microcontroller. No sensors. No wiring. The oscillator is a physical mechanism that converts continuous input (pneumatic pressure, for instance) into discrete, phased signals. The origami body folds and unfolds in response, crawling forward through coordinated extension and contraction.
The through-claim: computation doesn't require electronics. The four-phase oscillator is a state machine implemented in mechanics. It sequences through states, maintains phase relationships, and drives coordinated output — all functions normally attributed to a microcontroller. The “program” is the geometry of the oscillator itself.
The practical motivation is environments where electronics fail: high radiation, extreme temperatures, corrosive atmospheres. A purely mechanical robot can function where silicon can't. But the deeper interest is the minimal mechanism for coordinated locomotion. Four states, quarter-phase offset, origami folds. The design space of autonomous behavior is much larger than the design space of electronic control suggests. The robot is a proof that locomotion lives in the timing, not in the computation — and timing can be mechanical.
Liu, Mehta & Yan, 2603.23666. Robotics / origami / mechanical logic / locomotion.