Forms in the Round
Forms in the round—such that can be seen from any point of view—need special treatment. Height may appear normal, but the details round the surface will be materially affected by the rotundity. Thus a vase of varying contour might have its surface divided by a series of vertical lines, any one of which, seen from a point of view exactly opposite, would appear straight, whereas those approaching the profiles would appear curved proportionately to the sectional curvature.
No. 220. Effect of Perspective of Vertical Division.
Perspective also affects the vertical appearance more or less according to the profile curvature, and in decoration, for bodies that are bulbous in form, the foreshortening and its effect on details must be taken into consideration so as to avoid undesirable distortion.