114 THE
ARCHITECTUREOF HUMANISM
of constructive fact wherever theyoccur. And, if
the
Renaissancearchitects,
ontheirside, sometimes
introduced
a decorative order
where on purely
aesthetic
considerations the wall
would have
been
betterasanundividedsurface,oriftheyintroduced
adecorativeorderwhichwasill-proportionedin
itself,
or
detractedfromthespatialqualitiesofthebuilding
—
^which was, in fact, unsuccessful as decoration—
thiswemustviewasafaultratherof
practice
than
of
theory. And their tendency
to
abuse their
oppor-
tunitiesofpilastertreatmentmustbeheldtospring
fromanexcessivezealfortheaestheticsofconstruction,
thenature
ofwhichtheyunderstoodfarmoreexactly
and
logically than their modern critics, who,while
rightly insisting on the fundamental importanceof
structure
not only in architectural science, butin
architectural art, overlook the essentiallydifferent
part which it necessarily
plays in these twofields,
andwhoimaginethataknowledgeofstructuralfact
must modify, orcan
modify, our aesthetic
reaction
tojtructuralappearance.
/ Tothispositionthescientificcriticismwouldhave
a last reply. It will
answer
—
(for the complaint
has
often been made)
—
^that this apparent power
andvigourof the dome of
Michael Angelo
depends
on thespectator's
ignoranceofconstructivescience.
In
proportionaswe realise
the hiddenforces
which
such a domeexerts,
we must seethat the dome
is