The Butterfly House is a new Child and Youth Mental Health Center, integrated within the Children’s Clinical University Hospital (BKUS). Our task was to find and design the lighting on three functionally different floors of the building, which are separated into groups: 1. Reception and therapy area; 2. Vandal resistant section with patient wards, procedure and seminar rooms; 3. And open space office for doctors. The butterfly theme can be seen not only inside, but also in shape of the building whose facade and its elements are also illuminated along with the territory and the children’s playground.