Britain’s most enigmatic artistic duo met at art school in 1967 and have been together ever since. They live and work in London’s East End, named their house “Art for All,” and declared themselves “living sculptures.” In their large colorful multi-panel pictures they either wear spotless business suits or they appear naked. They are always together. Could Gilbert & George really be as inseparable as they appear? Judith Kampfner went to their house and studio in Spitalfields to find out.