Nick Ash - PhotographySocial Links Navigation Latest articles by Nick Ash - Photography Kvadrat Sisu fabric by Nanna Ditzel reinterpreted by Danh Vo Originally conceived by Nanna Ditzel in the 1960s, the Kvadrat Sisu upholstery fabric is a bold take on the designer’s iconic Hallingdal, now revisited by artist Danh Vo in 16 new colours