CONTENTS Preface v Acknowledgements vii Part A: History Robert Le Ricolais (1894-1977) Father of Spatial Structures R. Motro 1 The Crystal Palace and its Place in Structural History B. Addis 11 Aesthetics and Economy in Pedestrian Bridge Design S. Woodruff, D. P. Billington 37 Peter Rice: A Transversal Approach to Engineering K. Rice, N. Baldassini 53 Three-Dimensional and Dynamic Constructions Based on Leonardo Grids R. Roelofs 67 Nature Teaching Structures I Wester 79 Teaching of Space Structures with Initial Stresses R. Motro 97 Folding Sleeves - Variations on a Theme of the Earthworm C. Hachem, A. Hanaor 115 Soccer Ball Geometry, a Matter of Morphology R. Huybers 139 Spherical Triangulation Systems M. D. Davister 151 Form Finding and Analysis by Dynamic Relaxation M. R. Barnes 181 Multiparametered Formfinding Method: Application to Tensegrity Systems N. Vassart, R. Metro 209 A General Finite Element Approach to the Form Finding of Tensile Structures by the Updated Reference Strategy K-U Bletzinper, E. Rarnrn 223 Part C: Formex Configuration Processing Formex Configuration Processing I H Nooshin. P. Disney 249 Formex Configuration Processing II H. Nooshin, P. Disney 353 Formex Configuration Processing III H. Nooshin, R Disney 451 Elements of Theory of Plenices M. Bolourian. H. Nooshin . 551 Nexorades O. Baverel, H. Nooshin, Y. Kuroiwa, G. A. R. Parke 627 Part D: Deployable and Retractable Space Structures A Retractable Small-Span Roof Based on Thin-Walled Lightweight Spatial Units E. Kami, S. Pcllegrino 637 Evaluation of Deployable Structures for Space Enclosures A. Hanaor, R. Levy 657 Sources