| Introduction to the Dover Edition |
| Acknowledgments |
| 1. The Meaning of Abstraction |
| The Evolution of Abstraction |
| Learning the Abstract Language |
| Words vs. Images |
| A Study Program and Materials You Will Need |
| 2. Line |
| Does Line Exist? |
| Lines Are Not Lines |
| Stick Figures |
| Expressive Use of Lines |
| Four Orders of Line |
| Lines of Gravity and Levitation |
| Sun and Earth: Light Lines and Dark Lines |
| Lines as Movement and Time |
| Linear Forms |
| Line Forms Based on the Curve |
| Line Forms Based on the Straight Line |
| Cosmic Lines |
| Streaming Lines |
| Lines of Growth and Structure Formation |
| "Lines of Break, Fracture and Shear" |
| Lines of Erosion and Decline |
| 3. "Form, Shape, and Mass" |
| Our Instinctive Sense of Geometry |
| Going Beyond Geometry |
| Categories of form in Nature |
| Forms of Energy Fields |
| Aerial and Atmospheric forms |
| Cloud Forms |
| Water and Liquid Forms |
| Solids and Earth Forms |
| How We See the Earth |
| Crystals: A Close View |
| Rocks and Boulders |
| Larger and Farther Earth Forms |
| Plant Forms |
| Forms of Organisms |
| "Forms of Disintegration, Decay, and Death" |
| 4. Pattern |
| Cosmic Patterns |
| Weather and Atmospheric Patterns |
| Water Patterns |
| Patterns of Earth Forms |
| Patterns in Plants |
| Patterns in Branching |
| Patterns of Leaves |
| Patterns of Plant Growth |
| Effects of Plants on One Another |
| Patterns of Living Creatures |
| Patterns of Fish Forms |
| Patterns of Birds |
| Patterns of Vertebrate Animals |
| Patterns of Human Forms |
| 5. "Space, Proportion, Scale, and Perspective" |
| Inner Depth |
| Inner Proportion |
| Proportion |
| Scale and Space |
| Planes into Space |
| Visual Organization |
| Natural Perspective-the Visual Cone |
| Natural Perspective-the Viewpoint |
| Natural Perspective-Parallel Lines |
| Natural Perspective-Vanishing Points |
| Foreshortening |
| Some Final Remarks on Perspective |
| 6. "Light and Darkness, Black and White" |
| Daylight |
| Seasonal Alterations of Daylight |
| How Weather Alters Daylight |
| Night |
| Candlelight |
| Electric Light vs. Natural Light |
| Darkness |
| Luminosity in Plants and Animals |
| Atmospheric Luminosity |
| Lightning |
| Measurable Characteristics of Light and Shadow |
| Brilliance |
| Intensity of Light |
| Direction of Light Rays |
| Reflected Light |
| Cast Shadows |
| Light Effects on Objects with Plane Sides |
| Light Effects on Curved Surfaces |
| Compositional Uses of Blacks and Whites |
| Silhouettes |
| Light and Dark Lines |
| Engravers' Lines |
| Reverses and Shifts of Light and Darkness |
| Planes and Gradations of Atmospheric Light and Dark |
| Light and Darkness in Planes of Space |
| 7. The Color Expressions of Nature |
| Our Inner Sense of Color |
| After-Image Color Progression |
| Personal Color Sense |
| Logic of Paint Pigments |
| Blends and Gradations |
| Tinting and Shading Colors |
| Complementary Color vs. After-Image Color Progression |
| Opacity and Transparency |
| Two Opposing Groups of Color |
| Interaction Between Colors |
| Momentary States of Color |
| "Prismatic Colors, Coronas, and the Rainbow" |
| Cosmic Color |
| Atmospheric Color |
| Color of Water and Liquids |
| Earth Colors |
| Rock and Mineral Colors |
| Plant World Colors |
| "Flowers, Fruits, and Vegetables" |
| Color in Animals |
| Color in Fish |
| Color in Insects |
| Color in Reptiles |
| Color in Birds |
| Color in Mammals |
| Colors of Human Beings |
| Afro-Indian People |
| Oriental People |
| West Eropeans |
| Color Resonance and Harmony |
| Bibliography |
| Index |