Why symmetry in robot motion matters more than shape

Robot morphology typically emphasizes geometric symmetry, but this work shows that dynamic symmetry—uniform acceleration capability in all directions—is what actually matters. Researchers tested over 1000 simulated designs and found that higher dynamic isotropy (a measure of this balance) consistently improved tracking, task success, and energy efficiency. They built Argus, a 20-leg spherical robot with radially oriented actuators, that moves equally well in any direction, survives terrain damage, and keeps working even with broken legs.