Plastic aluminium composite panels with sound insulation effect. The external walls are mostly designed as ventilated curtain walls. Their closed surfaces consist of rectangular, upright aluminium panels with a plastic core, which were delivered to the building site cut and milled and folded into angular elements on site. In terms of form, they form a tent roof with an off-centre ridge point, which is used once as a positive and once as a negative form (Thomas Müller Ivan Reimann Architects).