Explain how various literary devices are used in act 1, scene 6 of Macbeth.

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In this scene, Duncan arrives at Macbeth's castle, where the Macbeths are already plotting to kill him. As such, there is dramatic irony in Duncan's opening comments that the castle "hath a pleasant seat." It is ironic that Duncan should associate the castle with such words as "nimbly," "sweetly,"...

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In this scene, Duncan arrives at Macbeth's castle, where the Macbeths are already plotting to kill him. As such, there is dramatic irony in Duncan's opening comments that the castle "hath a pleasant seat." It is ironic that Duncan should associate the castle with such words as "nimbly," "sweetly," and "gentle," given that the last thing the audience sees in scene 5 is Lady Macbeth commanding her husband, "leave all the rest to me" in the matter of the King's assassination. The irony continues in Banquo's observations that "heaven's breath / Smells wooingly here."

Duncan, evidently, has no idea what awaits him. He observes that Macbeth's "great love" has motivated him to reach the castle before Duncan; given what we have recently seen of Macbeth, although Macbeth does esteem the King in his own way, his love will indeed prove "sharp as his spur" for Duncan. But the King simply asks to be led to Macbeth, saying "we love him highly / And shall continue our graces towards him." His final line, "by your leave, hostess," is particularly ironic as it will indeed be by the actions of Lady Macbeth that Duncans "graces" will be heaped upon Macbeth, according to Lady Macbeth's plan. She intends to orchestrate the murder of Duncan in order to advance her husband in the social order of the kingdom.

Overall, the purpose of this short scene is to introduce ever-increasing irony and to fully convey how unsuspecting Duncan is of the Macbeths' motives.

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In this scene, Duncan arrives at Macbeth's castle to be his guest and accept his hospitality. Shakespeare reinforces the irony of this scene every step of the way. The type of irony he uses is called dramatic irony, because the audience knows what Duncan does not: that the Macbeths plan to murder him. 

The first irony is in Duncan's description of the setting. From the very first, Duncan misreads the scene, saying

This castle hath a pleasant seat. The air
Nimbly and sweetly recommends itself
Unto our gentle senses.
"Pleasant," "sweet" and "gentle" are ironic terms in this context: the castle will be the opposite of that to Duncan. 
 
Duncan then greets Lady Macbeth by twice commending her "love" in putting herself out to host him. Needless to say, "love" hardly motivates Lady Macbeth, who in the last scene called on the gods to harden her heart and make her ruthless and inhuman in every fiber of her being.
 
What follows Duncan's speech is Lady Macbeth's reply that everything they do is to honor Duncan—he accepts this as true while the audience knows he is being sucked ever closer to his doom. The irony grows thicker as Duncan asks where Macbeth is and speaks of Macbeth's "love" for him.
 
An added irony is Banquo's happy response to the castle. He notes how sweet "heaven's breath" (the breeze) is at the castle and says that the birds like to make their nests in such a place:
Where they most breed and haunt, I have observed,
The air is delicate.
Later, we will come to understand the irony of these words. The castle will become anything but "delicate" towards him and not all the sweet scents of the Orient will mask the stench of blood that haunts the grounds.
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In Act 1, Scene 6 ofMacbeth,Shakespeare uses many literary devices to enrich the layers of meaning within his text. 

Personification

In this scene, Banquo uses personification of a bird to agree with King Duncan that Macbeth's castle seems pleasant:

"This guest of summer,
The temple-haunting martlet does approve
By his loved mansionry that the heaven's breath
Smells wooingly here" (4-7).

Banquo extends the personification of the martlet throughout his short speech to Duncan, saying the bird approves of the castle because of the delicate air. 

Simile

Duncan uses a riding jargon as he asks after Macbeth, saying "we coursed him at the heels," meaning they rode closely behind him.  Thinking that Macbeth rode quickly, he compares Macbeth's love "sharp as his spur" which helped him home.  This simile suggests that Macbeth's great love for his home was the driving force behind his fast pace.

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