Sky's the limit: Boris Charmatz's rooftop dance reclaims cities from terror

His dancers have performed at Tate Modern and been lifted by cranes. Now, the maverick choreographer is taking them to the top of a multistorey carpark for a feverish protest showIt is dark, and a cold wind is blowing over the top floor of the multistorey car park where a crowd has gathered. The French city of Poitiers is small and pretty, but we are a long way from the bustling cafes of its centre. We have been herded to a rooftop by the railway tracks to watch Danse de Nuit, a work by the Fren