I'm going to put my two cents in here and try to address this Ghost issue from a few different points of view. Too long an answer, and no doubt I'll get arguments, but it's an interesting topic.
I think when we are trying to interpret a play - especially Shakespeare's plays where we don't have any authorial comments to help us understand what he had in mind when writing it - we have to look at the play from three different points of view. Two have been discussed here, but one has not.
First there is what serves the story - seeing the play from the point of view of the characters themselves as though they were real people (or spirits?) and examining the logic of the way they act based on their actions, thoughts, feelings and interrelationships. Some of the discussion of the Ghost and his presence in Hamlet has been focused on that - what he wants, why Gertrude doesn't see him, why he doesn't help Hamlet, and why he doesn't come back after the confrontation in the "closet" scene.
Second is what serves the dramatist's purpose - what he was trying to communicate and how he used the different aspects of the play to make that happen, what moves the story forward and contributes to the development of plot as well as the characters and their interrelationships, why he made the choices he did. Some of the discussion focused on those things - what was Shakespeare's intention in not returning to the Ghost later in the play, what was the purpose the Ghost's presence in the "closet" scene, what was the purpose of the Ghost in the structure of the play.
And third, on a much more practical level, is what serves the production - technically, financially and for the company for which it was written. Remember, Shakespeare was an actor and a share-holder in The Lord Chamberlain's Men (later called The King's Men when King James took over patronage of the acting company). He was, in effect, contracted to write for his company, and his plays were specifically designed to meet the needs of the company they were written for. Shakespeare wrote his characters to fit the specific actors they were written for, and rewrote and revised when other actors took their place. He wrote his plays, too, to account for the limitations of the company - including the size of the company and financial issue. While Shakespeare's plays generally have large casts of characters, the company was not particularly large. They could, of course, hire additional actors for certain plays, but that was an added expense. Most plays were written specifically to be doubled - that is, one actor played more than one role. And that meant that, for technical reasons, some characters were only seen in part of the play so that the actor could double as another character later in the play. It was often thought that in King Lear the same actor played The Fool and Cordelia (although that has been disputed). It is possible the same was true of the the Ghost.
There were several ways the Ghost could have been doubled. Although we don't know exactly what doubling Shakespeare used in his productions, modern productions have chosen several different alternatives (remembering that there needs to be time enough between entrances to change costume and for other technical aspects of production). Some double the Ghost and The First Player (my choice, since then when the Player plays the King in "The Murder of Gonzago" we are actually "seeing" King Hamlet as well. Others have doubled the Ghost and Claudius - more difficult and unlikely in Shakespeare's day, but and intriguing choice. Others double the Ghost and the First Gravedigger (although he was more likely doubled with Polonius). No matter what the choice, it required a judicious placement of the Ghost's appearances.
It is also possible - reported by Rowe in 1708 - that Shakespeare himself acted the part of Ghost. According to Rowe, "the top of his performance was the Ghost in his own Hamlet." If that was the case, then part of the reason why the Ghost's role was kept brief would have been that Shakespeare, as the playwright, would have also played the role of what we today call the director,although they had no such actual position in those days. Most often the playwright himself, if he was part of the company, oversaw the staging of the production. So Shakespeare would have kept the Ghost to a few brief, uncomplicated scenes - anyone who has ever tried to direct a show they were acting in can tell you how difficult that is.
As for the first two aspects.... Personally, I think that the Ghost's appearance is an integral part of the plot and makes sense in that context. While the earlier "Ur-Hamlet", perhaps written by Kyd, apparently did have a ghost, unlike the original Saxo Grammaticus History of Denmark story that it was adapted from, that ghost was reported to be far more along the lines of the older over-the-top horrific ghost than Shakespeare's more dramatically developed version. As for a reason for his presence in the closet scene, it seems clear to me - the Ghost had specifically told Hamlet to revenge his murder but to leave his mother out of his revenge. At that point in the play, Hamlet had just foregone an obvious chance to kill Claudius and then gone on quite literally attack his mother, both verbally and physically, and not so subtlely accuse her of complicity in his father's death. The Ghost's entrance was timed perfectly. Hamlet had just upbraided Gertrude for her nasty relationship with Claudius. She protests and begs him "No more, sweet Hamlet." But he continues, coming dangerously close of accusing him to Gertrude:
"A murderer and a villain,
A slave that is not twentieth part the tithe
Of your precedent lord, a vice of kings,
A cutpurse of the empire and the rule,
That from a shelf the precious diadem stole
And put it in his pocket --"
Gertrude again - "No more."
Then Hamlet again - "A king of shreds and patches --"
And enter the Ghost!
Perfect timing. Although the Ghost says little - simply a reminder to "whet thy almost blunted purpose" it follows that with a plea for Hamlet to help his mother rather than berate her. His entrance is timed to move Hamlet away from Gertrude and back toward revenge. Think what might have happened if the Ghost had not entered. Would Hamlet have accused Claudius directly? Would he have accused Gertrude? Would he have killed her against the Ghost's wishes?
Not mysterious and unfathomable at all. It's not the Ghost's job to help Hamlet. If it could do that it wouldn't need Hamlet. But it's the son's job to revenge his father, not the citizens of the country to revenge their king. It's a personal thing. He only returns to put Hamlet back on the track and to protect his wife. There really is no need for him to return again. Although I have to say that I intend, when directing my version, to have the Ghost return silently to watch the last scene in the play, leaving after Gertrude dies (the Ghost asked that Hamlet "leave her to heaven" and heaven has decided her fate when she drinks from the poisoned cup) and Hamlet kills Claudius.
I have a question - why do you think that the Ghost initially appears in full armor (that is explained in the text), but in the closet scene appears in his nightgown (there is no explanation given for that). Just curious what you think.





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I'll concede that one, Virgil. It's as good an answer as any!