When David and Kavi Moltz first launched their fragrance brand D.S. & Durga, the tagline was Perfume as Armchair Travel. Seventeen years on, the original tagline is gone, but the sentiment remains. For David, a self-taught perfumer who conceptualizes and studiously constructs each fragrance, and Kavi, a trained architect who conjures all of the brand’s design, visual branding, and retail spaces, each scent is its own world, alluding to places great and small, far-flung and familiar.