(_A_) _Zone of Enrichment_: In the margin.

_Reason for Choice_: Central area to be devoted to zone of service requiring simplicity in design.

[Sidenote: Marginal Enrichment]

_Type of Design_: Bands or borders.

_Inceptive Axis_: For corners; the bisector of the angle.

_Points of Concentration_: The corners and, if desired, at equal intervals between the corners.

_Ill.u.s.trations_: Figures 283, 284, 286, 287, 288.

(_B_) _Zone of Enrichment_: center of surface, free ornament.

[Sidenote: Center Enrichment]

_Type of Design_: Initials, monograms, street numbers, geometric patterns, and other examples for free ornament. A star or diamond is _not_ appropriate enrichment for a square area unless properly related to the contour by connecting areas.

_Inceptive Axes_: Vertical or horizontal diameters or diagonals.

_Points of Concentration_: Center of embellishment.

_Ill.u.s.trations_: Figure 285.

[Ill.u.s.tration: SURFACE ENRICHMENT OF CLAY

HIGH CYLINDRICAL FORMS. VASES, PITCHERS, ETC

PLATE 50]

(_C_) _Zone of Enrichment_: full surface enrichment in a horizontal position.

_Type of Design_: A symmetrical pattern generally radiating from the geometric center of the surface and covering at least two-thirds of the surface.

[Sidenote: Full Vertical Surface Enrichment]

_Inceptive Axes_: Diameters or diagonals of the area.

_Points of Concentration_: At the corners or the center of the outer margin; at geometric center, as in a rosette.

_Ill.u.s.trations_: Figures 283, 289, and 291.

[Sidenote: Full Horizontal Surface Enrichment]

(_D_) _Zone of Enrichment_: full surface enrichment in a vertical position.

_Type of Design_: A symmetrical pattern with a strong upward movement and covering more than one-half of the surface.

_Inceptive Axis_: The vertical center line.

_Point of Concentration_: Upper section of the surface.

_Ill.u.s.trations_: Figures 290 and 292.

[Sidenote: Free Balance]

(_E_) _Zone of Enrichment_: free balance over full surface.

_Type of Design_: Semi-decorative motive preferably covering the entire surface.

_Inceptive Axis_: Ma.s.ses freely balanced over the geometric center of the area.

_Point of Concentration_: Near, but not in the exact center.

_Ill.u.s.trations_: Figures 293, 294, 295, 296, 297, 298.

_Note_: The points of concentration should be accented by slight contrast of value and hue. See chapters on color.

[Sidenote: Shallow Circular Forms, Plate 48]

_Problems_: Plates, saucers, ash trays, card receivers, almond and candy bowls.

(_A_) _Zone of Enrichment_: margin of interior surface; margin of exterior surface.

_Type of Design_: Bands or borders thoroughly related to the structural contours. Bands for exterior enrichment may be placed directly on the contour, Figures 299 and 301, thus forming an

[Ill.u.s.tration: APPLIED AND CONSTRUCTIVE DESIGN

RULE 9: ENRICHMENT OF THE PRIMARY Ma.s.s BY A BORDER

PROBLEM: ENRICHMENT OF CLa.s.s 2 (POTTERY)

PLATE 51.--Instruction Sheet]

[Sidenote: Marginal Enrichment]