1. Chiastic Structure in Othello
But O, what damned minutes tells he o'er Who dotes , yet doubts ; suspects , yet strongly loves. —Othello 3.3
"Dotes" and "strongly loves" share the same meaning and bracket "doubts" and "suspects": dotes (A) doubts (B) suspects (B) strongly loves (A)
"Fair is foul, and foul is fair" — Macbeth

2. Chiastic Structure in Narrative
WHAT IS IT? A chiastic ('crossed,' 'formed in an X') structure is a rhetorical/poetic (and sometimes mnemonic) device whose most basic instance, the chiasm, takes the form of P, Q; Q', P', as in, "Ask not what your county can do for you, but what you can do for your country." (Criss-cross, see?)
But O, what damned minutes tells he o'er Who dotes , yet doubts ; suspects , yet strongly loves. —Othello 3.3
"Dotes" and "strongly loves" share the same meaning and bracket "doubts" and "suspects": dotes (A) doubts (B) suspects (B) strongly loves (A)
"Fair is foul, and foul is fair" — Macbeth

3. Chiastic Structure in Narrative: An Archetype, Maybe?
Chiastic structure of the Genesis Flood Narrative
A: Noah and his sons (Gen 6:10) *B: All life on earth (6:13:a) **C: Curse on earth (6:13:b) ***D: Flood announced (6:7) ****E: Ark (6:14-16) *****F: All living creatures (6:17–20 ) ******G: Food (6:21) *******H: Animals in man’s hands (7:2–3) ********I: Entering the Ark (7:13–16) *********J: Waters increase (7:17–20) X: God remembers Noah (8:1) *********J: Waters decrease (8:13–14) ********I': Exiting the Ark (8:15–19) *******H': Animals (9:2,3) ******G': Food (9:3,4) *****F': All living creatures (9:10a) ****E': Ark (9:10b) ***D’:No flood in future (9:11) **C': Blessing on earth (9:12–17) *B': All life on earth (9:16) A: Noah and his sons (9:18,19a)

4. Chiastic Structure in Narrative
Within this overall structure, there is a numerical mini-chiasm of 7s, 40s, and 150s:
α: Seven days waiting to enter Ark (7:4) *β: Second mention of seven days waiting (7:10) **γ: 40 days (7:17) ***δ: 150 days (7:24) ----χ: God remembers Noah (8:1) ***δ': 150 days (8:3) **γ': 40 days (8:6) *β': Seven days waiting for dove (8:10) α': Second seven days waiting for dove (8:12)
Or this, from the same article: "In 1986, William H. Shea proposed that the Book of Daniel is composed of a double-chiasm. He argued that the chiastic structure is emphasized by the two languages that the book is written in: Aramaic and Hebrew. The first chiasm is written in Aramaic from chapters 2-7 following an ABC...CBA pattern. The second chiasm is in Hebrew from chapters 8-12, also using the ABC...CBA pattern. However, Shea represents Daniel 9:26 as "D", a break in the center of the pattern." (!)

5. CHIASTIC STRUCTURE? Major character events in Othello…
***A. Curtain opens: Iago enters: His 1st word, a curse…explains motives
****B. Othello marries D: Holy Birth, Eternal Union in eyes of God HUBRIS
*****C. Othello defends himself; Will do no violence (Stories = Love)
*******D. Othello accused of “black” practices; Othello innocent HAMARTIA
**(******E. Enemy suffocated by water (Turks destroyed; O wins the war without lifting a finger)
**********F. Bedchambers (Honeymoon/sex/creation of life)
************G. Iago starts a brawl with Cassio; Iago lives viscerally through others
**************H. Cassio ‘s manhood wounded (loses job)
***************I. ”Divinity of hell” (Plans to make D a whore)
****************J. Othello witnesses Cassio’s “betrayal”; see something that is nothing
*****************K. “Excellent Wretch” (Othello “frees” D from slavery to men)
******************L. Iago “accuses” Cassio
*******************M. D. drops the hanky (cuckold’s horns/ disease/magic/medicine)
*********************N. Iago “marries” Othello “marry” (“Excellent good”) CLIMAX
*******************M. Othello has a trance fit (cuckold’s horns/disease/magic/medicine).
******************L. Iago accuses Cassio
*****************K. Othello strikes D (Othello “enslaves” D to men)
****************J. Othello tries to get Emilia to witness Cassio’s betrayal , thinks nothing is something
***************I. Othello calls D a whore
*************H. Cassio’s manhood wounded (loses leg)
***********F. Bedchambers (Strangulation/“sex”/Creation of death)
*********E. Desdemona suffocated by Othello (“Voice of God..wins the “war”, kills “Turk” with his hands)
********D. Emilia accuses Othello of “black” practices: Othello guilty
*******C. Othello defends himself; Violence is just (Stories = Hate) HAMARTIA
*****B. Othello learns the truth: Unholy Birth, Eternal Damnation in Eyes of God ANAGNORISIS
***A. Iago leaves: His curse completed; Refuses to explain motives