The theme of the curved tube, which in this case becomes an infinite handrail, introduces us to what probably represented one of the most interesting projects on the relationship between "design" and "interiors" created by Albini, namely the "furniture" system. for the stations of Line 1 of the Milanese Metro (1962-1964), designed with Franca Helg, Antonio Piva and with graphics by Bob Noorda. On this project for an architectural interior on an urban scale, the problem was to involve masses of users in various directions and with the minimum of friction and dispersion. Handrails and functional equipment are suspended from their anonymity, transformed into signals and detached with extreme clarity and elegance from the wall, to act as the supporting lines of a very sharp design, which marks a precise formation and spatial modulation, like a trace that defines and multiplies the spaces.