Mag-Chain: Reconfigurable 6-DOF Tangible Interfaces Using Magnetic Chains

We present a novel, simple method for creating reconfigurable 6-degree-of-freedom (DOF) tangible interfaces using diametrically magnetized cylindrical magnetic chains, termed Mag-Chains. These paired magnets support stable 3-DOF motions—bending, twisting, and sliding—with passive restoring forces, while constraining other axes. This enables rich multi-magnet dynamics and expands the design space for magnetic structures. We experimentally characterize Mag-Chains behavior across multiple design parameters and summarize practical design guidelines. We also integrate sensing using either 6-DOF optical tracking or simple contact switches. Building upon these findings, we developed a fully functional 6-DOF tangible input device featuring a large workspace and passive haptic feedback along all six axes—three translational and three rotational. To demonstrate versatility, we present three applications: interactive toys, a clip-on joystick with mobile camera tracking, and a miniature finger-worn controller. Our results highlight the potential of Mag-Chains as a compact platform for building sensor-integrated and reconfigurable tangible interfaces with rich motion expressiveness.