The Klimazone_n project was a proposal for a heating and cooling power plant for the Expo 2000 world fair in Hanover. The concept developed from two different givens: the existing masterplan for the Expo site on the one hand and the technical requirements for a power plant on the other hand. The masterplan set the building height at 23 meters, which the power plant did not require. Therefore, instead of constructing a functionless rooftop fence to meet the height requirement, the cooling volume was raised to 23 meters, creating a 10 meter tall void in the building’s center. Due to its high noise and vibration levels, the primary equipment is located on the ground floor, while the cooling units, because of their high air exchange rate, are located in the top portion of the building. The heat from the machines rises into the building’s new void located between the two rooms, while moisture from the cooling space trickles down from above. The combination of moisture and warm air produces a greenhouse-like environment, offering ideal conditions for tropical flora. The growth of this artificial landscape is furthered by the addition of soil for the tropical plants and transparent foil that encloses the volume. The in vitro landscape aims to transfer our polarized perception of human versus built versus technology into a more symbiotic relationship, an example of a biological cycle for fossil energy in a future form of nature.