THE MECHANICAL FALLACY
119
laws. Weight and resistance,
burden and effort,
weakness
andpower,areelementsinourown.exgeri-
ence,<aiidinseparableinthat
experiencefrom
feelings
ofease,exultation,ordistress. Butweightandresist-
ance,weaknessandpower,aremanifestelementsalso
inarchitecture,whichenactsthroughtheirmeansa
kindofhumandrama. Throughthemthemechani-
cal solutions of mechanical problems achieve
an
gesthetic
interestandanideal
value.
Structure,then,
is,ontheonehand,thetechniquebywhichthe
artof
architectureismadepossible;and,ontheotherhand,
itispartofits
artisticcontent. Butinthefirstcase
it
issubjecttomechanicallawspurely,in
thesecond
to
psychological laws. This double function, or
doublesignificance, ofstructure
is the causeofour
confusion.
I
For the aesthetic efficacy of
structure
doesnotdevelopor
varyparipassuwith structural
technique. They stand in
relation
to
oneanother,
but
notinafixedrelation. Somestructural
expedi-'
ents,thoughvalid
technically,arenotvalidaestheti-
cally,and
viceversa. Manyforceswhichoperate
in
themechanicalconstructionof a
buildingarepromi-
nentlydisplayed
andsharplyrealisable. They
have
amasteryoverthe
imaginationfarinexcess,perhaps,
oftheir
effectiveuse. Other
forces,ofequalmoment
towardsstability,
remainhiddenfromtheeye.
They
escapeus
altogether
;
or,
calculatedbytheintellect,
stillfindnoechoinour
physicalimagination.