Carsten Höller plays equally enticing tricks with light. He has filmed Swedish folk dancers performing with lights attacked to their heads and joints and then digitally edited it so that only tiny planets of white light set against total blackness are left. The lights switch off one by one until only a single dot remains and then the entire process restarts and all the dots dance for us. The sillyness of traditional Nordic folk dancing has been transformed into the wonder of a performance of changing molecules by skilled subtraction and abstraction.