For almost everybody reading this, reaching for the remote will be obvious and automatic. But if one literally has one’s hands full – or perhaps not when mobility is restricted by accident, illness, disability or the frailty of old age – even a little button can become a real barrier. If it were possible to control machines, lighting, furniture or games simply with a nudge of the arm against the back of an armchair or other solid object, those everyday barriers might fall. And in industry, for…