In <em>Mental Imagery: In Search of a Theory</em>, Pylyshyn revives
the spectre of the ``little green man'', arguing for a largely
symbolic representation of visual imagery. To clarify this problem, we
provide precise definitions of the key term ``picture'', present some
examples of our definition, and outline an information-theoretic
analysis suggesting that the problem of addressing data in the brain
requires a partially analogue and partially symbolic solution. This is
made concrete in the ventral stream of object recognition, from V1 to
IT cortex.