Goddess Walls are special walls left behind by the Goddess Hylia that Link can draw upon using the Goddess Sword in order to summon fairies or receive hearts, Rupees, bombs, or arrows. Link can cause a Goddess Wall to appear by playing the Goddess's Harp near its location. Once a Goddess Wall appears, Link can use it by charging up a Skyward Strike and then by approaching the wall to begin drawing on it. The presence of a nearby Goddess Wall is indicated by groups of Blessed Butterflies. Activated Goddess Walls will become usable again if Link leaves and re-enters a dungeon, moves between the surface and the sky, or if the player saves the game, exits, and resumes the game. Gorko uncovers information about Goddess Walls during his studies and informs Link about them.