The use of metaphors in Death and the King’s Horseman?

Metaphor: Marketplace
The marketplace is a metaphor for life and death. It contains life and death within it.

Metaphor: The Not-I Bird
The story of the Not-I bird is a metaphor for humanity's fear of death and the unknown.

Metaphor: The Play Itself
The entire play is a metaphor for the clash between European and African cultures, religions, and societies, as seen in the clash between Elesin and Pilkings.