1 An idealized world made of simple elements.- 2 Projections and shadows: Reduction of the dimension.- 3 Polyhedra: multi-faced and multi-sided.- 4 Curved but simple.- 5 More about conic sections and developable surfaces.- 6 Prototypes.- 7 Further remarkable classes of surfaces.- 8 The endless variety of curved surfaces.- 9 Photographic image and individual perception.- 10 Kinematics: Geometry in motion.- 11 Spatial motions.- 12 A variety of filling patterns.- 13 The nature of geometry and the geometry of nature.- 14 More applications.- A Geometrical freehand drawing.- B Geometry and photography.- Bibliography.- Index.