I then asked eighteen blind volunteers to feel the wheels and assign one of the following motions to each wheel: wobbling, spinning fast, spinning steadily, jerking or braking.

• 然后我请了18位盲人志愿者先摸轮子，之后把下面的运动状态和每个轮子对号入座：抖动、快速转动、匀速转动、猝然转动和刹车。