bird, beaker, water
Description:
The
bird's
fuzzy
head
must
be
soaked
to
serve
as
the
heat
sink.
As
the
head
cools
by
evaporation,
the
centre
of
gravity
of
the
bird
shifts
as
coloured
liquid
from
its
tail
rises.
The
bird
pivots
at
the
hips,
leaning
forward
and
dipping
its
head
into
the
water
reservoir.
The
drinking
bird
is
a
heat
engine,
showing
a
conversion
of
energy:
thermal
to
mechanical.
PIRA 4C31.30, 4F30.01