In a white room above the alley where David Bowie posed for the cover of The Rise and Fall of Ziggy Stardust and the Spiders from Mars, Bobby Gillespie and Jim Lambie are discussing hair. “Do you ever get those days,” the artist is saying to the rock’n’roll star, “when your hair is just mental?” “Aye,” the rock star replies. “When I wash it and go to sleep, then I wake up and the front bit goes.”