"All the real knowledge which we possess depends on
methods by which we distinguish the similar from the
dissimilar. The greater the number of natural distinctions
this method comprehends the clearer becomes our idea of
things. The more numerous the objects which employ our
attention the more difficult it becomes to form such a
method, and the more necessary."
-- Carolus Linnaeus, Founder of Taxonomy, Genera Plantarum, 1737
"Is it plant, animal, or mineral?"