The book 'Conditional Design. An Introduction to Elemental Architecture' is the sequel to 'Operative Design. A Catalogue of Spatial Verbs' and further explores the operative in design in a more detailed, intentional, and functional manner.
The points of an Icosahedron (one of the 5 Platonic Solids) an be made by intersecting 3 Golden rectangles (based on the proportion Phi - - the Golden Ratio). An icosahedron has 20 triangular faces, 30 edges and 12 vertices.