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(5) Envelopes Envelopes are formed when a line moves contacting an object and changing an angle little by little. This represents a strong feeling of curved surfaces (Figs. 398-400). Envelope lines can be created using even curved lines.
However, a strong feeling of a curved surface is created just by concentrating
similar shapes with curved lines towards a point. This effect is even stronger
than that of envelope lines (Fig. 397). This is because curved lines generate
a significant density change similar to radial lines in the case of straight
lines. Cubic effect has a general tendency to become weak when the width
of lines is increased.
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