Where did they come from? Why did they reveal themselves to Macbeth only? Were they his assets or foes? And as an extension, why did Shakespeare like to introduce characters from another world?
Supernatural elements are of central significance in many of Shakespeare's plays, contributing to their dramatic power and intrigue. Ghosts haunt political spaces and internal psyches, witches foresee the future and disturb the present, fairies meddle with love and a magus conjures a tempest from the elements.
Shakespeare used to write for the stage and these characters from another world were so useful for creating on-stage effects which people of that time loved. Additionally, they provided support to the plot.
Great point about the on-stage special effects. Made me wanna watch a Shakespeare play right now haha
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