Continuous sloping roof is an open public space with big steps acting as a walking route and bleachers for the east sports ground in the same time. Moreover, lawn roof provides spaces for grass skating, yoga, picnic and more for the community without charging a fee. People could walk slowly up to roof deck on 4th floor along the slope and down through a cantilevered stairway on the north. These form a round route in an “artificial hill” bringing the pleasure of climbing a real mountain into the crowded city town.