Finishing materials have been kept to a minimum. There are no movable system walls, lowered ceilings, net curtains or pile carpets. Not only is this environment-friendly, but it gives the building a 'natural' simplicity and sobriety. In many places only a thin coat of eco-friendly laquer or paint distinguishes the structural work from the finished surface. A striking feature is that although many of the materials are far from glossy in appearance they have a most pleasing tactility. Those parts with which the user frequently comes in contact, such as doors, handrails and desk tops, are made of wood. The grain of the wood stimulates the tactile sense and, due to wood's low thermal conductivity, it always feels warm to the touch. The desks are topped with laminated beech wood, which is neither painted nor varnished but impregnated with a vegetable oil. The working surfaces thereby present a stimulus to the sense of smell as as of touch; the offices are redolent of linseeds oil, beeswax and freshly sawn timber. The visual warmth of the treated wood also contributes greatly to the pleasantness of the interior.