<P> Harry starts classes at Hogwarts School, with lessons including Transfiguration with head of Gryffindor, Minerva McGonagall, Herbology with Head of Hufflepuff, Pomona Sprout, Charms with Head of Ravenclaw Filius Flitwick, and Defence Against the Dark Arts with Quirinus Quirrell . Harry's least favourite class is Potions, taught by Severus Snape, the vindictive Head of Slytherin who seems to loathe Harry . Harry, Ron, and Hermione become far more interested by extracurricular matters within and outside the school, particularly after they discover that a huge three - headed dog is standing guard over a trap door in a forbidden corridor . They also become suspicious of Snape's behaviour and become convinced that he is looking for ways to get past the trapdoor to whatever it's hiding . </P> <P> Harry discovers an innate talent for flying on broomsticks and is appointed as Seeker on his House's Quidditch team, a wizards' sport played in the air . His first game goes well until his broomstick wobbles in mid-air and almost throws him off . Ron and Hermione suspect foul play from Snape, whom they saw behaving oddly . For Christmas, Harry receives an invisibility cloak from an anonymous source and begins exploring the school at night and investigating the hidden object further . He discovers the Mirror of Erised (backwards for "desire"), in which the viewer sees his deepest desires becoming true . </P> <P> Thanks to an indiscretion from Hagrid, Harry and his friends work out that the object kept at the school is a Philosopher's Stone, made by an old friend of Dumbledore named Nicolas Flamel, which grants its user immortality, as long as it's constantly used . Harry is also informed by a centaur he meets in the forest that a plot to steal the Philosopher's Stone is being orchestrated by none other than Voldemort himself, who would use it to be restored to his body and come back to power . When Dumbledore is lured from Hogwarts under false pretences, Harry and his friends fear that the theft is imminent and descend through the trapdoor themselves . </P> <P> They encounter a series of obstacles, each of which requires unique skills possessed by one of the three, and one of which requires Ron to sacrifice himself in a life - sized game of wizard's chess . In the final room, Harry, now alone, finds Quirrell, who admits that he had tried to kill Harry at his Quidditch match against Slytherin . He also admits that he let a troll into Hogwarts . Snape had been trying to protect Harry all along rather than to kill him, and his suspicious behaviour came from his own suspicions about Quirrell . </P>

Who created the sorcerer's stone in harry potter