large barrels in an alcove in the corridor that holds the kitchen. To enter, one must tap the barrel two from the bottom in the middle of the second row in the rhythm of "Helga Hufflepuff". Unlike any other house, the Hufflepuff common room has a repelling device that douses the illegal entrant in vinegar if the wrong lid is tapped or the rhythm is wrong. The Hufflepuff common room is filled with yellow hangings and fat armchairs and it has little tunnels leading to the dormitories, all of which have perfectly round doors, like barrel tops. Ravenclaw Ravenclaw values intelligence, learning, wisdom and wit. The house mascot is an eagle and the house colours are blue and bronze (blue and silver in the Harry Potter and Fantastic Beasts films and on the ties and scarves). During the books, the head of this house is the Charms teacher, Professor Filius Flitwick, and the house ghost is the Grey Lady. According to Rowling, Ravenclaw corresponds roughly to the element of air. The founder of this house is Rowena Ravenclaw. The dormitories are in Ravenclaw Tower, on the west side of Hogwarts. The common room is round and filled with blue hangings and armchairs, has a domed ceiling painted with stars and features a replica statue of Rowena wearing her diadem. Harry also notes that Ravenclaws "have a spectacular view of the surrounding mountains". A logical riddle must be solved to gain entry, whereas the Gryffindor and Slytherin common rooms only require a password. Professor McGonagall, the head of the Gryffindor House, solves the riddle accurately. Slytherin Slytherin values ambition, cunning, leadership, and resourcefulness; the Sorting Hat said in Harry Potter and the Philosopher's Stone that Slytherins will do anything to get their way. The house mascot of Slytherin is the serpent, and the house colours are green and silver. Throughout the series, until the seventh book, the Head of House is Professor Severus Snape. Then, the previous Head of House Professor Horace Slughorn comes out of retirement, re-assuming authority after Snape becomes headmaster. The ghost of Slytherin house is Bloody Baron. According to Rowling, Slytherin corresponds roughly to the element of water. The founder of this house is Salazar Slytherin. The Slytherin dormitories and common room are reached by speaking a password to a patch of bare stone wall in the dungeons, which causes a hidden door to open. The Slytherin