3. The Four Houses Represent The Four Elements
Warner Bros.The four Houses into which students are Sorted upon entering Hogwarts are meant to loosely correspond with the four classical elements: temperamental Gryffindor as fire, steadfast Hufflepuff as earth, wise Ravenclaw as air, and enigmatic Slytherin as water. These associations are hinted in some ways throughout the story, such as by Gryffindor being represented by red, the Slytherin common room being located below the lake, and the opposing nature of those two houses. Rowling revealed this tidbit of trivia after being asked a question on the villainy of the Slytherin house; it serves as a reminder that the four Houses symbolise harmony and balance, and that they are not divided but separate components of a greater whole.