How does Shakespeare establish characters and theme in the opening act of "Macbeth"?

Shakespeare's characters and themes in "Macbeth" are strongly developed right from the beginning. Shakespeare uses a variety of techniques to establish his themes and characters, via the dialogue and stage directions in his play. The introductory actions of the characters, along with the location and weather of the scene, work in conjunction with the language devices to quickly establish the key characters and themes. A prominent theme of Macbeth is the supernatural. Shakespeare uses the …

…represent normality and to compare the behaviour of the other characters with. Shakespeare's diverse use of language is his strongest tool to put across his characters and themes. His most striking devices are the use of imagery, antithesis, soliloquies and metaphor. Using them he establishes in the play a dark mood and contrasting characters. The performance of the play will further enhance his devices and acting will contribute to how the audience perceive his characters.