TONAL VALUES IN ARCHITECTURAL DRAWINGS
In paraline drawings, the t hree-dimensional nature of
forms and the spaces they define aremorereadily
apparent than in plan, section, and elevation drawings.
Tonal values are t hereforeused primarily to articulatethe
orthogonal relationship between horizontal and vertical
planes.
• It is usually better to apply tonal values to the
horizontal rather than the vertical planes of a para line
drawing. Toning the horizontal planes not only
establishes avisual base for the drawing but also aids
in defining the shape and orientation of the vertical
planes.
• Indicate cuts to reveal the interior spaces of abuilding
with either acontrasting line weight or achange in tonal
value.
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I ARCHITECTURAL GRAPHICS