Rewrit

in R. Hoffmann and V. Torrence, Chemistry Imagined, Smithsonian Institition Press, Washington 1993, pp. 74-77; in M.A. Safir, ed., Connecting Creations: Science-Technology-Literature-Arts, Santiago de Compostela: Centro Gallego de Arte Contemporáneo (2000). Also translated into Spanish in the Spanish edition by Carlos Quiroga.