The supernatural, which encompasses all the different entities of the metaphysical world, plays a vital role in Shakespeare's Macbeth. It enables the audience to perceive the hidden `black desires' present in individuals and how qualities such as `vaulting'ambition when exaggerated can be detrimental.

The Witches, referred to as the `Weird Sisters' by many of the characters - lurk like dark thoughts and unconscious temptations to evil. Quote

The mischief they cause is partly due to their powers but mainly the result of being able to identify the weaknesses of their specific interlocutors. Having the ability to see the future they intentionally play upon Macbeth's ambitions like puppeteers.

The effect on having such hideous creatures in the play is to establish the supernatural order which delights in destruction and turmoil. The cruelty of the witches is evident from their misdeeds, for in their world `fair is foul, and foul...