All examples are black and white images, partitioned by lines such that crossing a line switches the background color and the foreground color. (Sometimes it is not clear which is "background" and which is "foreground".) In the space between two dividing lines, there is a black and white scene; the outlines of the shapes are curves dividing black from white. Images sorted left are such that each outline-curve present in a scene that comes in contact non-tangentially with a dividing line continues across the dividing line, across which the black and white sides of it switch.

Examples (especially right) usually have ambiguity to some degree; depending on how a person reads the images, dividing lines may be confused for curves within a scene.

Adjacent-numbered pages:
BP519 BP520 BP521 BP522 BP523  *  BP525 BP526 BP527 BP528 BP529

fuzzy, unwordable, anticomputer, traditional, blackwhiteinvariant

Aaron David Fairbanks

Adjacent-numbered pages:
BP1088 BP1089 BP1090 BP1091 BP1092  *  BP1094 BP1095 BP1096 BP1097 BP1098

nice, precise, allsorted, boundingbox, left-narrow, right-null, perfect, pixelperfect, preciseworld, bordercontent, blackwhiteinvariant

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Jago Collins