The inner garden requires natural illumination, achieved through a ceiling roof formed by two curve attractors that follow the corridor’s path. Both of two curve attractors make an extrusion with different dimension on ceiling. The voronoi holes pattern extrusion on ceiling serves a function as a sun path for plants, while the corridor’s ceiling functions as a space for installing lights. The distinctive of voronoi estrusion design optimizes natural and artificial lighting, directing focus towards the intended objects.