'Plato (left)
and Aristotle in Raphael's 1509
fresco, The School of Athens.
Aristotle holds his Nicomachean
Ethics and Plato gestures to the
earth, representing his view in
immanent realism, whilst Plato
gestures to the heavens,
indicating his Theory of Forms,
and holds his Timaeus,'
according to Wikipedia (click
pic)