How giant digital adverts could soon be in our cities on March 26, 2017Passers-by on a London street were recently amazed to see a fleeting image of a pink tongue protruding from fruitily plump lips, seemingly suspended in mid-air. It was the famous logo for the Rolling Stones and was part of an experiment by tech start-up Lightvert. Its technology can produce images that appear to be 200m […]