City of London’s third tallest skyscraper, The Diamond, revealed

Tower will be able to accommodate more than 6,000 workers with free public viewing gallery

Why taking it slow in an art gallery could change your life

Got time on your hands? Why not try Tate Modern’s ‘slow looking’ sessions? Being encouraged to look at a Hockney painting on a school trip completely altered my world view

Stars, limos, clubs … Andy Warhol’s life exposed in unseen images

Book and exhibition will be followed by digitisation of pop artist’s photographs, giving public access to extraordinary ‘visual diary’

The Marvellous Mechanical Museum review – marvels ex machina

Compton Verney, Warwickshire
Four centuries of automata whir into wondrous life in a show that’s as much performance as it is exhibition