Once a common feature of rural American homes, the cellar door is a slanted trapdoor set outside a house to cover a flight of stairs to the basement. Cellar doors are generally unremarkable. The term “cellar door” itself, however, is often proposed as one of the most beautiful phrases in English. It is said to have been a favorite of Edgar Allen Poe, and its beauty has been invoked by H.L. Mencken, Dorothy Parker, and J.R.R. Tolkien. What is supposedly so special about it? Discuss