400
DOC. 42
SPECIAL AND GENERAL
RELATIVITY
Relativity
and
the Problem of
Space
161
themselves
felt.1
In order
to
arrive
at
the idea of
an
objective
world,
an
additional constructive
concept
still
is necessary:
the
event
is
localised
not only
in time,
but
also in
space.
In the
previous paragraphs
we
have
attempted
to
describe
how the
concepts space,
time and
event
can
be
put psycho-
logically
into relation with
experiences.
Considered
logically,
they
are
free creations of the human
intelligence,
tools
of
thought,
which
are
to
serve
the
purpose
of
bringing experi-
ences
into relation with each
other,
so
that
in
this
way
they can
be
better
surveyed.
The
attempt
to
become conscious of
the
empirical
sources
of these fundamental
concepts
should show
to
what
extent
we are
actually
bound
to
these
concepts.
In this
way
we
become
aware
of
our
freedom,
of
which,
in
case
of
necessity,
it
is
always
a
difficult
matter
to
make sensible
use.
We still have
something
essential
to
add
to
this stretch
concerning
the
psychological
origin
of the
concepts
space-
time-event
(we
will call
them
more
briefly "space-like,"
in
contrast to
concepts
from
the
psychological sphere).
We have
linked
up
the
concept
of
space
with
experiences using
boxes
and the
arrangement
of material
objects
in them. Thus this
formation of
concepts already presupposes
the
concept
of
ma-
terial
objects
(e.g.
"boxes"). In the
same
way
persons,
who had
to
be introduced
for
the formation of
an objective concept
of
time, also
play
the
role
of
material
objects
in this connection.
It
appears to me,
therefore,
that the formation
of
the
concept
1
For
example,
the order of
experiences in
time obtained
by
acoustical
means can
differ
from
the
temporal
order
gained visually,
so
that
one cannot
simply identify
the time
sequence
of
events
with the time
sequence
of
experiences.