A successful tragedy depends on the creation of a suitable atmosphere. Macbeth's grotesque murder spree is not suspected by Duncan, for Duncan thinks highly of Macbeth and his beautiful castle, which blinds him from the truth. Also, the witches and apparitions lurk like dark temptations of evil, and contribute to the atmosphere of deceit in Macbeth's crimes. The castle is a mina point in atmosphere for many events of this pay. Macbeth's ruthless acts are inspired by a suitable atmosphere created in this Shakespeare play.
Duncan arrives at Macbeth's castle with no concern on his well-being, but only on how wonderful it is to be there, "This castle hath a pleasant seat; the air/ Nimbly and sweetly recommends itself/ Unto our gentle senses," (1.4.29-30). He doesn't suspect that he is a target of Macbeth's deceit to become King. Though Duncan doesn't suspect his doom, Lady Macbeth does, "The raven himself is hoarse/ That croaks the fatal entrance of Duncan/ Under my battlements," (1.5.36-39). She knows that there is death lurking in the air, because a raven croacking on a house meant death was near. Duncan had absolutely no suspicions of Macbeth, for he does consider him highly, " Conduct me to mine host, we love him highly, And shall continue our graces towards him," (1.4.29-30). Duncan is blinded by the castle's beauty, and his respectful interpretation of Macbeth being his dear friend, that he doesn't know he is been plotted to be murdered, that night.
The witches contribute a lot to the atmosphere, because of the evil they carry. Macbeth knows that they are evil because of the weather they permit around them, "So foul and fai a day I have not seen," (1.3.38). The day is good because the battle has been won, but bad with the thunder permitted by the witches" weather. The witches know there is an evil influence, "Fair is foul, and foul is fair: Hover through the fog and filthy air," (1.