Tanztheater Wuppertal revive their founder's striking evocation of death, sex and corruption in the eternal cityWhen Pina Bausch's work was first shown in London in 1982 it changed the way we thought about dance. Bausch made the stage look like a whole new playground of possibilities, creating some indefinable genre of dance theatre that hovered between choreography, performance art, absurdist theatre and dreaming. E…