An elegant setting forms the backdrop for lacy crochet collars, exquisite accessories, and delicate jewelry. Designer Ann-Kathrin Carstensen’s small empire combines a store, studio, and crochet workshop. With a bit of luck, you can watch the artists at work—all of whom are Turkish women. Not only is this nearly-forgotten art form conquering the world of haute couture: It is also the centerpiece of an extremely successful cultural integration project.