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Drunk analogy.



Movement away from the wall is more rapid than the aimless meanderings of
a random walk.  The acquisition of a radical new trait is more likely to
lead you leftward.  For example, the attainment of language provides a
completely novel substrate upon which natural selection can work.  This
increasing complexity of substrates may not be progress, but isn't it fair
to call it an engine leading some creatures away from the wall?