[Illustration: No. 210. Ceiling Decoration. Growth from Angle.] When panels or enclosed spaces are used on walls or on furniture of any height the vertical direction should be emphasised as a general rule; but if the height is less than the width, the decoration, though it should remain vertical in tendency, should also spread so as to conform to the width. The design of a panel or enclosed space, whatever the shape or attitude, should be complete in itself, having its proper start and appropriate terminals. If the enclosing border were removed the detail should, by its general disposition maintain the shape, even though the whole surface may not be occupied. Rich ornamentation is thoroughly in keeping with the nature of the panel--certainly more interest should be centred on panel decoration than on adornment in more subordinate positions. The decoration may either completely fill the space or only partially do so. In the latter case, the shapes of the unoccupied parts must be carefully considered. [Illustration: No. 211. Semi-Lunette Panel. Central Feature based on Circle.] Whether the design is a unit repeated on a central axis or is a balanced one, is largely a matter to be settled by individual taste and the position of the panel. Both treatments are admissible in a range of panels; greater variety can be obtained by symmetrically disposed designs being flanked on either side by balanced designs. _Juxtaposition_ When panels occur together, either side by side or ranged one above the other, they may exert influence on one another. For example, vertical features close to the framing stiles should be repeated in the adjacent panel even though the width of each panel may differ. When the panels are one above the other, central features should be avoided and the interest should be kept close to the opposing margins; otherwise the effect will be spotty and lacking in repose. [Illustration: No. 212. Panels in Juxtaposition.] As panels present the best opportunity for display, on account of their treatment being comparatively untrammelled by the considerations to which the more structural features must submit, there is open to them [Illustration: No. 213. Design for Panel based on Treatment of Celery. By C. A. Sheehan, Bristol.] a proportionately large field of possible decoration. In the first place, the panel may be treated pictorially, with due regard to the requirements of surface and reciprocal effect which must be insisted on in mural decoration. If not treated pictorially, ornament of a traditional character, or designs derived more directly from natural forms can be made use of. In either case the ornament must complete itself within the given area. _The Growth Line_ [Illustration: No. 214. Analysis of Composing Lines of Panel.]