Shape-changing Interface

A physical interface that conveys information by changing its own shape or physical orientation — for example, a servo-driven lever that rotates to point in a specific direction, a cube whose top half turns to indicate a heading, or a surface that deforms under the user's hand. In blind-navigation research, shape-changing interfaces are an alternative to speech or vibration for conveying directional information: they do not block ambient sounds, can communicate continuous direction rather than discrete 'left/right' instructions, and are unaffected by floor texture in the way that suitcase-mounted vibrators can be. Early studies suggest blind users often strongly prefer shape-changing direction indicators to text-to-speech turn-by-turn guidance.