As part of a campaign to earn the city of Kosice, Slovakia, a reputation of being the European Capital of Culture, Atrium Architects has transformed a former heat exchanger, located in the heart of the city, into a cultural, public and sports center. Located in the Nad Jazerom residential district, the exchangers functional transformation is reflected in its concept by means of a clean-shaped joist acting as a dynamic boulder. the top of the structure contains an atrium which holds four large trees creating and isolated space from the world around. the rugged facade accentuates the public area. The exchanger has five different interconnected floors based as galleries, each fulfilling a different function.