Themes
A gun is a representation of an olden-day dagger. This makes it easier to comprehend the old play for the modern day audience if well-known weapons are used to exemplify a main theme.
Is this a dagger which I see before me,
The handle toward my hand? Come, let me clutch thee.
The crown symbolises Macbeth's strong desire for royalty, power and position. His wife, Lady Macbeth manipulated him into murdering those who got in his way.
"If chance will have me king, why, chance may crown me."
The bloody hands exemplify the extensive amount of blood shed on Macbeth's hands. He murdered numerous innocent people "that got in the way of his 'fate' as the King of Scotland.
My hands are of your colour (red), but I shame
To wear a heart so white."
The grave indicates death as a frequent occurrence in the play of Macbeth.
"And all our yesterdays have lighted fools
The way to dusty death."