Rule 6h. Borders intended for vertical surfaces may have a strongly upward movement in addition to the lateral movement, provided the lateral movement dominates.
Rule 6i. Inlayed enrichment should never form strong or glaring contrasts with the parent surface.
Rule 6j. Carved surface enrichment should have the appearance of belonging to the parent mass.
Enclosed Enrichment—Partly Enriched Panels for Surface Enrichment
Rule 7a. Marginal panel enrichment should parallel or be related to the outlines of the primary mass and to the panel it is to enrich.
Rule 7b. Marginal points of concentration in panels should be placed (1) preferably at the corners or (2) in the center of each margin.
Rule 7c. To insure unity of design in panels, the elements composing the point of concentration and links connecting them must be related to the panel contour and to each other.
Enclosed Enrichment—Fully Enriched Panels for Surface Enrichment
Rule 7d. The contours of fully enriched panels should parallel the outlines of the primary mass and repeat its proportions.