“Our "reality" is the Tall Ships Sailing Club, a recreational entity composed of sailing enthusiasts and amateur nautical historians. The Club has a library of about 500 books, most of which are nonfiction materials relating to practical sailing. Scattered throughout the collection are works of naval history, art books containing photographs and paintings of ships, compendia of nautical terminology and so on. Although the collection grows over time, the library has a small budget and adds only a dozen books a year. This slow rate of growth has a direct impact on our thesaurus. As designed, the thesaurus is expected to remain current for a long time; furthermore, the names of most sails have been fixed for centuries and new terminology is added at a glacial pace.”