In his essay, he compares tragedy to history, epic poetry, science -- lumping together everything and starting with the basics. Mimesis, Aristotle's term for imitation, is his way of describing theatre as a study of human nature and behavior, showing the truth; possibly, most similar to our "realism." That being said, a representation of truth and social transformation as the goal, Aristotle lists the six most important priorities.
Six Elements of Tragedy
- Plot
The structure of events is the goal of a tragedy. - Characters
Unlike the dithyramb, focus on specific characters. Men were good only by good choices, demonstrated by their actions and emotional qualities. It would be anti-mimetic to have unrealistic characters represented on stage: a brave woman or a free-willed slave. Had to be plausible and "appropriate" imitation. - Thought
Each character's logic or rhetoric while trying to make a point. - Language
The beauty of verbal expression. - Music
La. La. La. - Spectacle
"Visual adornment," cosmetics. The less scenic design, the more elevated the poet.
- Peripeteia - reversal, plot twist
(we realize that the good character is now the bad character) - Anagnoresis - recognition, a shift from ignorance to awareness
(Jocasta's "ah-ha" moment) - Hamartia - error, commonly mistaken as "tragic flaw"
(Oedipus's insistence of finding the culprit) - Catharsis* - purging of pity and fear, purification, collectively changed and made different
(punishment by putting out his eyes, confronting the largest theme in the play)
*Tracing back to Aristotle's science days, catharsis is actually an ancient Greek medical term. Fun fact.