From a windscreen to an insulated raincoat. That, in brief, is the evolutionary process of the façade. In the meantime the façade is becoming an ever smarter and more active interface between the inside and the outside, as an increasing amount of technical functions is added to it. Think of high-performance insulating systems or domotics to control sun blinds or night time ventilation. They allow more comfortable and safer interiors. And those innovations on or in the façade make buildings more sustainable. Sustainability therefore has our constant attention.