“Afer
this
I
saw
a
vast
instrument,
round
and
shadowed,
in
the
shape
of
an
egg,
small
at
the
top,
large
in
the
middle,
and
narrowed
at
the
bocom;
outside
it,
surrounding
its
circumference,
there
was
a
bright
fire
with,
as
it
were,
a
shadowy
zone
under
it.
And
in
that
fire
there
was
a
globe
of
sparkling
flame
so
great
that
the
whole
instrument
was
illuminated
by
it.”
Vision,
from
Scivias
(detail
of
facsimile).
1150-‐1175.