An international design revolution is incorporating both traditional and new concepts to create bioclimatic sustainable architecture. Building energy reduction is a key goal for new and renovation projects designed to these principles, but it must be balanced against occupant well-being and the desire for fresh air and natural light. Exterior walls are being transformed from relatively simple climate defensive mechanisms to more active membranes. Innovative hybrid second-skin designs incorporating shading systems are being used on award-winning projects around the world, and these concepts could be applied to a much broader range of buildings.