An exhibition called 'onetree' that opened at the Edinburgh Festival should be selfexplanatory. All the objects in the exhibition were made from a single oak tree that was nearing the end of its natural life. Among the designers, artists and craftspeople who were invited to make something 'beautiful and useful' from the tree, was Andrew Skelton who trained as an architect but now designs and makes furniture. His solution was in the form of 'heart seats'which combine wavy wooden slats with shells of Blanc de Bierges artificial-stone shells and stainlesssteel supports. The seats are designed to allow people to sit in a variety of ways, and have arms that are positioned to help the less able to get up. The exhibition will tour several venues, ending up at London's Geffrye Museum next year.