p392fig11.29 Boundary webs of the smallest scales are closer to the boundary edge of the ellipse, and progressively larger scale webs penetrate ever deeper into the ellipse image, due to the amount of evidence that they need to fire.  Taken together, they generate a multiple-scale boundary web with depth-selective properties that can capture depth-selective surface filling-in.<BR>||  3D vision and figure-ground separation.  Multiple-scale, depth-selective boundary webs.  Instead, different size detectors generate dense boundary webs at different positions and depths along the shading gradient. Small-far, Larger-nearer,  Largest-nearest. Each boundary web captures the gray shading in small compartments at its position and depths. A shaded percept in depth results.