People prefer wearable devices that are unobtrusive, fit into daily life and existing habits, and look stylish. But even if all these boxes are ticked, do they really want to wear technology on their wrists, faces and around their necks?

With half a billion wearable devices shipping in the next few years and going straight onto wrists, shoes, glasses and lapels, soon interacting with smart cities will seem as 'normal' as checking Facebook.

A conduit between cars and phones, Nissan's stylish Nismo Smartwatch has a range of utilities beyond 'ordinary' smartphone capabilities. Will it cleanly slot into the 'internet of things'?

Project Glass is a lightweight, context-aware pair of spectacles which projects your social and search data onto your field of vision, as and when you need it. Its purpose is to make technology invisible so people can start living again.