The place seems to have been fashioned as a dwelling for dryads and hamadryads, for nixies and pixies, and all the fabled spirits of forest and stream.
In medieval times, the image of the double fish tailed siren was called a nixie or evil water spirit. Yet, the nixies were more likely daughters of the primordial goddess named Nyx or mother night, who hovered over ancient waters, rather than evil spirits.
Mailers who are registered participants in the Postal Service's Address Change Service (ACS) system expect to receive their address corrections and nixie notifications by electronic messages;(..).
Another good reason to use first-class mail is the fact that it will often be forwarded or, if need be, returned to the sender if the address is bad. (In the industry, this is called a “nixie.”) It is important to keep an eye on the nixie rate if you are using first-class mail.