(A) Zone of Enrichment: upper margin of exterior.
Type of Design: Borders of units joining each other or connected
by bands or spots acting as connecting links. Rule 9c.
Inceptive Axes: Vertical elements of the exterior surface. Elements are imaginary lines dividing the exterior surface into any given number of vertical sections. Elements used as center lines form the axes of symmetry about which the butterfly of Figure [308] and similar designs are constructed.
Points of Concentration: On each vertical element.
Illustrations: [Figures 308], [309], [310], [311], [312], [316].
Full Vertical Surface Enrichment
(D) Zone of Enrichment: full vertical surface.
Type of Design: Extended borders with strongly developed vertical lines or forms. Less than one-half of the surface may be covered.
Inceptive Axes: Vertical elements.
Points of Concentration: In upper portion of vertical elements, hence in upper portion of area.
> Illustrations: [Figures 307], [314], [317], [318].
(E) Zone of Enrichment: free balance of full surface. (See D, above).
Illustration: [Figure 315].
Problems: Vases, jars, pitchers, tall flower holders, covered jars for tea, crackers, or tobacco.
High Cylindrical Forms, Plate 50
Marginal Enrichment
(A) Zone of Enrichment: margin of exterior.
Type of Design: Borders of geometric units, freely balanced floral units, and other natural motives placed in upper margin of mass.
Inceptive Axes: Vertical elements of cylinder.
Points of Concentration: In upper portion of vertical elements.
Illustrations: [Figures 319], [320], [321], [327], [331], [332].
Full Surface Enrichment
(D) Zone of Enrichment: full surface of exterior.
Type of Design: Free of formal conventionalized unit repeated on each vertical element. The units may be juxtaposed or may be connected by bands or similar links.
Inceptive Axes: Vertical elements of cylinder.
Point of concentration: In upper portion of vertical elements.
Illustrations: [Figures 322], [323], [324], [326], [328], [329].