His gaze is directed to a particular point, but there he finds a "vacancy", a lack of something. For Gertrude, Hamlet's mind is deficient, he has created something that does not exist and therefore he must be “mad” (III.iv.105). However, according to the captions, the Phantom entered “in his nightgown.” The audience shares this vision with Hamlet, connecting them more to him than to Gertrude. However, it is still ambiguous whether the Ghost is a production of the mind or the Ghost everyone had previously seen due to Gertrude's inability to see.