How does an adaptation where the ghost and Hamlet are played by the same actor differ from an adaptation where the ghost and Hamlet are played by two separate actors?

When one actor plays both Hamlet and the ghost, the visual similarity can make the ghost seem like an extension or projection of Hamlet himself. That blurs the boundary between the two characters and suggests Hamlet may be mad. Playing them with two separate actors instead makes the ghost seem more clearly independent of Hamlet.

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