What is chiasmus? Chiasmus is a literary technique where the second half of a phrase mirrors the first half in reverse order. For students, it is often easiest to call this mirrored structure because it shows how two linked or contrasting ideas are flipped to sharpen their effect.
In Macbeth, the classic example is:
“Fair is foul and foul is fair.”
The first half gives us “fair” then “foul”. The second half reverses it: “foul” then “fair”.
That is mirrored structure. It is neat, unsettling, and placed right at the start of Macbeth. Shakespeare basically puts the play’s moral confusion on the table before Macbeth has even found the table.
How Does Mirrored Structure Work?
Mirrored structure works by flipping the order of key words, ideas, or grammatical parts.
You can think of it as an ABBA pattern:
| First half | Pattern | Second half | What happens |
|---|---|---|---|
| “fair” | A | “foul” | B becomes first |
| “foul” | B | “fair” | A moves to the end |
The sentence does not just repeat an idea. It folds back on itself.
In IGCSE or GCSE English, that matters because the form helps create the effect. The mirror makes the reader compare the two sides.
Why Do Writers Use Chiasmus?
Writers use chiasmus to make two ideas feel tightly connected.
Sometimes the ideas are opposites. Sometimes they are related ideas that swap position. Either way, the mirror makes the reader notice the relationship between them.
The effect is usually emphasis through balance, contrast, or reversal.
For exam analysis, do not stop at “it creates emphasis”. Say what is emphasised.
Ask:
- What two ideas are mirrored?
- What qualities are contrasted?
- Which quality becomes stronger?
- Why does that matter to the story, message, character, or theme?
How Can I Spot Chiasmus?
Look for a phrase or sentence where the second half reverses the first half.
The clearest examples repeat the same words:
“Fair is foul and foul is fair.”
Some examples repeat the same pattern or ideas, rather than the exact same words. For students, the useful test is simple: has the line flipped its first half around?
What Does Chiasmus Look Like In Macbeth?
In the Oxbridge GCSE Tutor Witches guide, “Fair is foul and foul is fair” is treated as mirrored structure.
Read the fuller guide here: How Does Shakespeare Present the Witches in Macbeth?
The line appears in the first scene. That timing matters. Shakespeare puts the moral mirror into the play before Macbeth arrives.
“Fair” means good, attractive, or morally right.
“Foul” means bad, ugly, or morally rotten.
The mirror makes both ideas depend on each other. Good contains bad. Bad can wear the mask of good.
That helps introduce Macbeth’s tragedy. He begins as “brave” and noble, but later becomes a traitor and tyrant. The mirrored structure reflects that moral reversal.
The effect is not just that the line sounds spooky.
It exaggerates the opposition between good and evil, then makes that opposition unstable. Macbeth can look heroic and still carry the flaw that destroys him.
How Do I Analyse The Effect?
Use this route:
- Name the mirrored parts.
- Explain the qualities being contrasted.
- Explain which quality is exaggerated.
- Link that quality to the story or message.
For Macbeth, that could sound like this:
“Fair is foul and foul is fair” uses mirrored structure because “fair” and “foul” swap places in the second half of the line. “Fair” presents goodness and appearance, while “foul” presents evil and corruption. The mirror exaggerates the link between the two, making good and evil feel dangerously mixed. This matters because Macbeth starts as a brave warrior, but his hidden ambition turns him into a tyrant.
Is Chiasmus The Same As Antimetabole?
They are closely related.
| Term | Simple meaning | Example |
|---|---|---|
| Chiasmus | Ideas or structures repeat in reverse order | “By day the frolic, and the dance by night” |
| Antimetabole | The same words repeat in reverse order | “Fair is foul and foul is fair” |
| Mirrored structure | Student-friendly label for the reverse-order pattern | “fair / foul / foul / fair” |
For IGCSE or GCSE English, “mirrored structure” is often the clearest phrase. If your teacher uses “chiasmus”, use that too. The mark comes from explaining the effect.
Common Mistakes
Do not say mirrored structure is only repetition. Repetition repeats. Mirrored structure reverses.
Do not say the effect is only emphasis. Say what is emphasised.
Do not analyse the technique instead of the idea. The technique matters because it makes the contrast sharper.
Which Study Guides Show This In Action?
These Oxbridge GCSE Tutor guides are the best next stops:
- How Does Shakespeare Present the Witches in Macbeth?
- 18 literary techniques you need to smash a Grade 9 in Macbeth
- How is Macbeth Presented?
Frequently Asked Questions About Chiasmus
What is a simple definition of chiasmus?
Chiasmus is a phrase or sentence pattern where the second half mirrors the first half in reverse order.
What is mirrored structure?
Mirrored structure is a student-friendly name for chiasmus. It means one half of a phrase is flipped around in the second half.
What is an example of chiasmus in Macbeth?
“Fair is foul and foul is fair” is a famous example. “Fair” and “foul” swap places, creating a mirror pattern.
Is chiasmus the same as antimetabole?
Not always. Chiasmus can reverse related ideas or structures. Antimetabole repeats the same words in reverse order.
What is the effect of mirrored structure?
Mirrored structure exaggerates the qualities being contrasted. In Macbeth, it makes good and evil feel closely linked and unstable.
How do you analyse chiasmus in an exam?
Name what is mirrored, explain the qualities being contrasted, then link the exaggerated quality to the story, message, character, or theme.
Other Techniques in this series
- Metaphor
- Simile
- Symbolism
- Personification
- Juxtaposition
- Mirrored structure
- Foreshadowing
- Emotive language
- Wordplay
- Repetition
- Rhetorical question
- Enjambment
- Rhyming, assonance and alliteration
- Imperative
- Superlative
- Simple short sentence
- Dramatic irony
- Triplet
Reference List
Department for Education (2013) “GCSE English language: subject content and assessment objectives”. Available at: https://www.gov.uk/government/publications/gcse-english-language-and-gcse-english-literature-new-content (Accessed: 13 May 2026).
Department for Education (2013) “GCSE English literature: subject content and assessment objectives”. Available at: https://www.gov.uk/government/publications/gcse-english-language-and-gcse-english-literature-new-content (Accessed: 13 May 2026).
Department for Education (2014) “National curriculum in England: English programmes of study”. Available at: https://www.gov.uk/government/publications/national-curriculum-in-england-english-programmes-of-study/national-curriculum-in-england-english-programmes-of-study (Accessed: 13 May 2026).
Oxford University Press (2026) “chiasmus noun”, Oxford Learner’s Dictionaries. Available at: https://www.oxfordlearnersdictionaries.com/definition/english/chiasmus (Accessed: 13 May 2026).
Plain English Campaign (n.d.) “Free guides”. Available at: https://www.plainenglish.co.uk/free-guides (Accessed: 13 May 2026).
