Ultrahaptics is one of the most interesting startups coming out of the UK. Their technology roadmap should in the near future allow users to control computing devices without needing to wear or touch any physical objects.

"Ultrahaptics has developed a unique technology that enables users to receive tactile feedback without needing to wear or touch anything. The technology uses ultrasound to project sensations through the air and directly onto the user. Users can ‘feel’ touch-less buttons get feedback for mid-air gestures or interact with virtual objects."