Oasi is the name of this WT project , its configuration was inspired from the structure and functioning of cactus plants. This biomimic has provided the functioning and design of the building to be more energy efficient, and sustainable. OASI's most outstanding property is it's capability to collect rainwater. For this reason on the facade and all around the structure there are organic shaped niches which help collect the rain water to the bottom of the building, where then they are stored, purified and used. Most of the materials of the building are energy efficient, such as natural ventilation, self cleaning windows, photocatalytic facade, purify the air, and building shell with photovoltaic paint to provide energy. As Hong Kong being one of the biggest skyscraper city in the world and considering that these buildings use great amount of energy and water, OASI proposes a new approach. The main concept of OASI which is mainly about sustainability and water efficiency, is related to make a connection with Hong Kong's portal area.