C1 TOMORROW at Potsdamer Platz opens its doors to all visitors. The building planned by Renzo Piano in 1993-1997 is being refurbished by Baumgarten Simon Architekten. The ground floor invites in the future as a sort of marketplace with cafes and food stalls to linger. The four orientations of the building to the north, south, east and west are reflected in the redesigned orientation system of Moniteurs. Constructed words and pictograms.