POCHE & SPATIAL DEPTH
To establish aclearfigure-ground relationship
between solid matter and spatial void, we can
emphasize the shape of cut elements withatonal
value or poche that contrast s w hthe spatial
it
field of the building section.
• We typically blacken or poche the floor, wall,
and roof elements that are cut in sm
all-scale
building sections.
• If only a moderate degree of contrast w the
ith
drawing field is desired, use a middle-gray value
to illuminate the shape of the cut elements.
This is especially important in large-scale
sections, when large areas of black can carry
too much visual weight or create too stark a
contrast.
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• If vertical elements, suchas wall patterns an
d
textures, give the field of the drawing atonal
value, a dark gray or black tone may be
necessary to produce the desired degree of
contrast between solid m er and spatial
att
void.lnthis value scheme, use progressively
lighter values for elements as they recede into
the t hird dimension.
• Remember that the supporting soil mass is
also cut in building and sit e sections. Any tonal
valuegiven t ocut elem s should there
ent
fore
con inue into this mass.
t
• If we w to show a building
ish
system in asection drawing, w should be
e
careful to delineate thebelow-gradeportion as
an integral part of the surrounding soil mass.
MULTIVI E DRAW INGS / 59
W