Architectural designs that have not been realized are ‘conceptual’. Interpretations from the 1960s involved space-defining, simulated images projected into the sky by lasers, and volumes roofed by moving air, with walls of fire and water (e.g. proposals by Yves Klein (1928–62) and Werner Ruhnau (1925– ) ). Air-jets instead of structures have been proposed, creating instant forms. Some have held that it is the process that counts in architecture, rather than the final building.
Anno Domini, xlv/3 (March 1975), 187–8;Casabella, ccccxi (March 1976), 8–13;Design Quarterly, 78/79 (1970), whole issue