114 THE
ARCHITECTUREOF HUMANISM
of constructive fact wherever theyoccur. And, if
the
Renaissancearchitects,
ontheirside, sometimesintroduced
a decorative order
where on purelyaesthetic
considerations the wall
would have
beenbetterasanundividedsurface,oriftheyintroduced
adecorativeorderwhichwasill-proportionedin
itself,
or
detractedfromthespatialqualitiesofthebuilding
—
^which was, in fact, unsuccessful as decoration—thiswemustviewasafaultratherof
practicethan
oftheory. And their tendency
toabuse 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
reactiontojtructuralappearance.
/ Tothispositionthescientificcriticismwouldhave
a last reply. It will
answer
—
(for the complainthas
often been made)
—
^that this apparent powerandvigourof the dome of
Michael Angelodependson thespectator's
ignoranceofconstructivescience.
In
proportionaswe realise
the hiddenforceswhichsuch a domeexerts,
we must seethat the dome
is