Rejoice  the wellnigh impossible has happened Londons austere Hayward Gallery has been transformed into a place full of wonder And not thankfully by some hugebudget megahyped multimedia extravaganza but by a charmingly idiosyncratic investigation into an almost forgotten aspect of the last 60 years A new exhibition traces the history of kinetic art  that is art which is concerned with movement  in the twentieth century In the process it reveals that making artworks which either move by themselves or investigate the idea of movement in some way has been a consistent if largely unrecognised theme of some of the most fascinating creative activity of this century And not only that  the marvellous range of paintings and drawings documents and films on kinetic art assembled by curator Guy Brett who has made a lifelong study of the subject are presented largely unmediated by text Visitors unharried by explanations are left to have the pleasure of making connections and discoveries for themselves