A new theory of volume formation and completion will be described using line drawings and several new types of illusory figures.
Contours specify potential or partial volumes, and partial volumes can link up at a distance.
Volume completion can occur in the absence of relatable image contours or image contour tangent discontinuities. In surface occlusion, a distinction often has been made between global and local completions. Global completions account for overall regularity, whereas local completions proceed in the locally simplest way. We studied similar tendencies with respect to self-occlusion of object parts. In two experiments, participants had to compare two views that could be two depth- rotated versions of the same object.