In 3d line drawing which has hidden lines displayed, a labeling method for imperfect line drawing aiming for searching external contour lines is described.
The concrete method for deleting hidden line and the form of data structure which describes any polyhedron have been provided, too.
Here's a short gnuplot example that illustrates 3-d function plotting with contours and hidden line removal.
So balance is Camus' hidden line, which correspond to absurdity in his works.