Commentaries by the editors to this comprehensive anthology in the area of physics-based vision put the papers in perspective and guide the reader to a thorough understanding of the basics of the field. Paper Topics Include: - Shape from Shading - Photometric Stereo - Shape Recovery from Specular Reflection - Shape Recovery from Interreflection - Shape Recovery from Shadows - Radiometric Analysis of Stereo and Motion - Physics-Based Sensor Fusion