In 1996, Zimbabwe's capital Harare welcomed the Eastgate Centre, designed to be completely climate controlled by natural convection. Outside air that is drawn in is either warmed or cooled by the building mass depending on which is hotter, the building concrete or the air. This eliminates the need for energy-intensive climate regulation. Since the building was opened, Mick Pearce's design has served as a showcase for the benefits of designing according to nature's rules. The design has since inspired other buildings around the world, including Portcullis House in London, and buildings by Anders Nyquist in Sweden.