THE MECHANICAL
FALLACY 109
whethertheidealisas rationalandconsistent
asit
sounds.
In the first place,it is clear that
the vivid con-structive properties ofabuilding,in sofarasthey
areeffectivelyconstructive,must
existas/ac^5i,- The
securityof
the
building,and
hencealsoofanyartisticvalueitmaypossess,dependsonthis
;andasupportwhichseemedtobe
adequatetoitsload,butactuallywasnot,would, asconstruction,bewrong. Butinsofaras
theyarej\a^d,theymustexist
asappear-ances.. It is theeffect which the constructive pro-
pertiesmakeontheeye,andnotthescientificfacts
thatmaybe
intellectuallydiscoverable
aboutthem,which alone can determine their vividness. Con-struction, it may be granted, is always, or nearly
always, insomesense, ourconcern,butnot alwaysin the same sense. The two requirements
whicharchitecture so far evidently has are constructiveintegrity in fact, and constructive vividness inappearance.Now, what our scientific critics
havetakenforgranted,isthatbecausethese
tworequire-ments havesometimes beeil satisfied at the samemoment, andby
the same means, nootherwayof
satisfyingthemis permissible. Buttherehas beennonecessityshownthusfar,norisit
easytoimagineone,forinsistingthatthesetwoqualificationsshouldalwaysbeinterdependent,andthatboth
mustinvari-ablybesatisfiedatasinglestroke. Theirvaluein