112 THE ARCHITECTURE
OF
HUMANISM
domeofSt.Peter'sweseeaconstruction,thegrandeur
ofwhichlies preciselyinthe self-containedsense
of
its mass,andthe vigorous,;powerful contour
which
seemstocontrolandsupportitsbody. Yetactually
the very attempt to give it thischaracter,
to add
this majestically structural effect to the
resources
ofarchitecturalart,meant that MichaelAngelo
ran
counter to the scientific requirements of
a dome.
)The masswhich gives sosupreme
a senseof
power
is,
in
fact,weak. MichaelAngelowasforced
torely
uponagreatchaintoholditinitsplace,
andtothis
hissuccessors
added
five
greatchainsmore.) Hadhe
adhered,as hismodern critics w6ulddesire,
tothe
Byzantinetypeofdome,whichalone
wouldofitself
have been
structurally
sufficient, he must have
crowned St. Peter's with a mass that would
have
seemed relatively lifeless, meaningless,
and inert.
Structural
'
truth
*
mighthavebeengained.
Struc-
tural vividnesswould havebeen
sacrificed. It was
not,
therefore, from any
disregard of the essential
constructiveorfunctionalsignificanceofarchitectural
beautythathe sodesigned the
greatdome,but,on
the contrary,
from
a determination tosecure
that
beautyandtoconveyit.j Itwasonly
fromhisgrasp
oftherelativeplacefor
architectureofconstructional
fact and constructional appearance,
that he was
enabled,
insosupreme
ameasure,tosucceed. And
itwasbytheirsenseofthesame
distinctionthat
the