Table of contents : Front Matter....Pages i-ix Introduction....Pages 1-4 Impossible Pictures....Pages 5-20 Labeling Line Drawings of Polyhedra....Pages 21-54 Discrete In°ation Using Cubic Corners....Pages 55-78 A Rich Labeling Scheme for Curved Objects....Pages 79-96 Depth Recovery Through Linear Algebra....Pages 97-124 Wireframe Projections....Pages 125-182 Simplification of Combinatorial Problems....Pages 183-215 Tractability of Drawing Interpretation....Pages 217-230 3D Reconstruction of Ambiguous Pictures....Pages 231-236 Back Matter....Pages 237-255