greek tragedy "parapateo"? things are opposite of what they seem?

I believe the word you're seeking is "peripeteia."

"A reversal of fortune [peripeteia] is the change of the kind
described from one state of things within the play to its opposite."

Introduction to Greek Theatre: Aeschylus, The Oresteia
http://courses.nus.edu.sg/course/ellpatke/en3268/en3268_lec_2_greek_tragedy.htm

"Aristotle introduces the concepts of peripeteia (reversal of fortune)
and anagnorisis (discovery or recognition) in his discussion of simple
and complex plots... Peripeteia is the reversal from one state of
affairs to its opposite. Some element in the plot effects a reversal,
so that the hero who thought he was in good shape suddenly finds that
all is lost, or vice versa."

Spark Notes: Poetics (Aristotle)
http://www.sparknotes.com/philosophy/poetics/section5.rhtml

Google search strategy:

Google Web Search: greek tragedy peripeteia
://www.google.com/search?hl=en&ie=UTF-8&q=greek+tragedy+peripeteia

I hope this is precisely the information you need. If it is not, or if
anything is unclear, please request clarification; I'll be glad to
offer further assistance before you rate my answer.

Best regards,
pinkfreud