The works of Empedocles are excluded from this work because, though it is written in hexameter, it does not characterize its subject matter as a "representation of life," or mimesis.  
In this treatise, a statue of Mitys killing Mitys' murderer is given as an example of a providential incident which produces amazement.  The works of Empedocles are excluded from this work because, though it is written in hexameter, it does not characterize its subject matter as a "representation of life," or mimesis.  Key concepts discussed include the moment of recognition, or anagnorisis, the fatal flaw, or hamartia, and purgation, or catharsis, which is the most important function of tragedy.  FTP, name this important work of literary theory on non-prose writing written by Aristotle.
In this treatise, a statue of Mitys killing Mitys' murderer is given as an example of a providential incident which produces amazement.  
Poetics