This the very coinage of your brain:
This bodiless creation ecstasy
Is very cunning in.
– William Shakespeare
Hamlet, Act 3, Scene 4. Hamlet engages with the Ghost for a second time in the Queen’s chamber. But Gertrude believes that Hamlet is in a state of madness, he is hallucinating and imagining the presence of the Ghost, which she cannot see. So is the Ghost real, or a figment of Hamlet’s imagination?