Book excerpt: Neon designer Dusty Sprengnagel has travelled the world, photographing neon. His company in Vienna has won many awards for its excellence in design and installation of neon signage and graphics. This book features the best neon he's designed and seen, and "neon guru" Rudi Stern, author of Let there be Neon and a good friend of Sprengnagel's, provides timely commentary in the introduction.