'Cloud ’68 – Paper Voice' pays homage the radical architecture movement in Europe from the 1950s to the 1970s, which initiated numerous new forms of experimental expression. A selection of 177 graphic pieces – lithographs, drawings, original etchings, and ephemera from the personal collection of the Chilean architect Smiljan Radić—reveal the scope of the diverse architectural approaches from those years. Works by Constant, Utopie, Guy Debord, Asger Jorn, Haus-Rucker-Co, Archigram, and Superstudio, among others, are displayed in 33 panels that recall Aby Warburg’s ‘Mnemosyne Atlas’. The publication is complemented by interview fragments by the critic and curator Hans Ulrich Obrist.