222 THE ARCHITECTURE OF HUMANISM
another volume. But the main divisions of the
subject—space,
mass, line
and
coherence,with their
moreobviousapplications—mayherebesingledout.
/
The principleisperhapsmostclearlytoberecog-
nised in line\Lines ofonesort or anotheralways
formalargepartof
what
is
visually
presented
tous
inarchitecture. Nowinmostcases,whenwebring
ourattention tobearononeoftheselines,its'
whole
extent isnot seen with absolute
simultaneity
;
we
'
follow' it with our eye. The mind passes suc-
cessively over points in space, and that
gives us
movement. But when we have
got movement we
have
gotexpression. For our own movements are
the simplest, the most instinctive, and
the most
universalformsofexpression
thatweknow./ldenti-
fied
with ourselves,'movement has meaning;
and
line,throughmovement,becomes
agesture,anexpres-
siveact\ Thus,
forexample,the curvesofavolute
are
recognisedasboldorweak,tense
orlax,powerful,
fiowng,andsoforth. Itis
bysuch termsasthese,
in fact, that we
praise or condemn
them. But we
must
recognise them as having
these qualities by
unconsciousanalogy
with ourownmovements,
since
itisonlyinourown
bodiesthat
weknowtherelation
of
theline—ormovement
—tothefeelingit
denotes.
Movement is
most obviously
communicated by
curvedlines
;
butitisconveyed
alsoby
lineswhich