The idea bases on recovering the site surface with continuous terraced open air plant museum up to the top of the hill where the sculpture like structure is situated. That structure, namely the arboretum building composes the final touch with its spiral form. That gives the sense of climbing to the hill as a part of the landscape. That action of climbing continues even in the building with ramped floors also at the roof garden. The building itself has the role of a passage between surface of the hill and the beautiful city panorama. The design provides this scenario where ever one reaches to the site.