Greyworld, ‘Words’, Installation, 2009. Photo: Not available. Courtesy: BBC Radio. “Words” is an installation commissioned by the BBC for the Free thinking Festival, in Gateshead, UK.Visitors to the installation space are requested to think of a word. Any word at all. They are handed a white cube, which they hold. As they speak their word in to the box, the box begins to glow with a gentle blue light.They are then invited to explore what appears to be a large empty space, delineated by a red line around its edges. As they wander off in to this area they realise that in fact, invisible to the eye, there is a rich sonic environment to explore, full of words that are nestling amongst trees, flitting around pools of water, or hiding out in caves.Some of these words live here permanently, and some have been dropped by people walking through the space. If the visitor wants to do this,