The World of Harry Potter
From Np Hogwarts
The Wizarding World
The wizarding world in which Harry finds himself is both utterly separate from and yet intimately connected to our own world. Unlike the fantasy worlds of Narnia and Middle-earth, the world of Harry Potter exists alongside ours, and many of its institutions and locations are in towns, such as London, that are recognisable to anyone. It is a fragmented collection of hidden streets, overlooked and ancient pubs, lonely country manors and secluded castles that remain utterly invisible to the non-magical population (known as "Muggles"). Wizard ability is inborn, rather than learned, although one must attend schools such as Hogwarts in order to master and control it. Since one is either born a wizard or not, most wizards are unfamiliar with the Muggle world, which appears odder to them than their world would to us. Despite this, the magical world and its many fantastic elements are depicted very matter-of-factly. One of the principal themes in the novels is the juxtaposition of the magical and the mundane; the characters in the stories live utterly normal lives with utterly normal problems, despite their magical surroundings.
Motifs
Owls: Owls are perhaps the most visible motif of the Wizarding world. They appear at the start of the first novel, presaging what is to come, and play a very visible role in every novel following. They act as the principal form of communication among wizards (somewhat like carrier pigeons) and also as pets. Harry Potter has a pet owl named Hedwig.
The Hogwarts Express: An old-fashioned train drawn by a scarlet steam locomotive that is the principal means by which a wizard in training can reach Hogwarts. It departs from Platform 9¾ at King's Cross Station, London.
Houses: Like many boarding schools, Hogwarts is divided into four separate houses, and students are sorted into their respective houses at the start of their first year. They are Gryffindor (which favours courage), Ravenclaw, (which favours intellect), Hufflepuff, (which favours hard work and fair play) and Slytherin (which favours ambition). Upon arrival, Harry, along with his friends (Ron and later Hermione), are sorted into Gryffindor.
Quidditch: a spectator sport in the Wizard world, played up in the air on brooms. Similar in style to basketball and soccer. Harry is an unlikely Quidditch star at his school.
Blood purity: Wizards tend to view Muggles with combination of condescension and suspicion, but for a few wizards this attitude, over the centuries, has descended into bigotry. Characters in the novels are classed either as "Muggle-born", (a wizard born to Muggles) "half-blood" (a wizard born to one wizard parent and one Muggle or Muggle-born parent) and "pure-blood" (a wizard born to parents of purely wizarding lineage). The maintenance of blood purity is the primary motivation for many of the series's darker characters.
Themes
See: http://en.wikipedia.org/wiki/Themes_and_motifs_in_Harry_Potter