Drilled and corrugated folding-sliding panels by H&dM 
Herzog & de Meuron studio is carefully exploring the possibilities of perforated sheet filters; (see also  by the same architects).The whole façade of this building in Munich is covered with a layer of horizontal folding sliding metal panels. The manipulation of these leaves can be done from the inside through a sophisticated mechanism, so as a pantograph.
Each leaf is formed from a drilled metal sheet, with circular perforations about a couple of centimetres diameter. The perforated sheet is then corrugated, giving the panel more rigidity and a more complex transparency.
From the inside, the visual texture of the metal sheet seems a textile curtain, and allows the view to the outside and an adequate lighting. Solar protection is not very high, but perhaps appropriate to these latitudes.