Architecture, Building and Structure Design Hebei Hua Ao Hospital Trauma Treatment Center by Ling Chen Hebei Hua Ao Hospital is a trauma treatment center built in Zhangjiakou, China. The design concept is a snow ribbon, expressed as a horizontal facade with window heights that change with orientation and function. The varied windows control sun shading and daylight and reduce the need for air conditioning. Solar collector panels on the roof save electric energy. Waiting seats are arranged in enclosed groups to encourage communication, and artworks and landscape features are placed indoors to help patients feel calm. The hospital combines treatment, rehabilitation and education functions.