The Technorama science centre is internationally recognized as a place where visitors can learn through interactive experiments about the relation between nature and technology. One of the conditions of the competition for the reorganization of the centre was that it had to stay open during the building work. Dürig's solution was to insert a long, multifunctional 'Raum-Kanal' (space-tunnel), connecting and integrating individual functional episodes and connecting the two ends of the building visually and physically. It would also welcome the flow of visitors, providing them with a space in which they can walk around or rest, while at the same time, thanks to its strong communicative character, orienting and directing them. The red colour of the floor widens the perception of the space, while lighting elements, inserted in the walls give continuity between the inside and outside. The intervention has transformed a functionally inflexible building into a well-organized organism.