Every first year's first glimpse of the Hogwarts castle begins once the double oak doors opens and reveals to them the Entrance Hall. It's large and magnificent, built in grand magical splendor. The Grand Staircase, that would lead students up to the first floor of the castle, is made entirely of polished white marble that would often end up scuffed by troublemakers who love sliding down the railings. Located here are four large hourglasses filled with marbles symbolizing each of the four Hogwarts houses. The hourglasses are used to tally house points and automatically adjusts itself every time a prefect, head or professor adds or deducts points from students.