Into Orbit: my dizzying drop down the world's biggest slide

Carsten Höller has turned Anish Kapoor’s ‘zombie pylon’ into a 178m corkscrew thrill-ride – our architecture critic pulls on a helmet and takes the plungeNever has an attraction promised so much yet delivered so little. It was the roller coaster without a ride, the helter skelter without a slide, a £20m mountain of steel leering above London’s lean Olympic stadium as a mocking monument to the vanity of the city’s former mayor, Boris Johnson, and its