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Ironically, though Hamlet has dramatized his parents, both by rewriting the play and placing them on the stage for all to observe, he's the star of the show. As the Court enters, he is draped in a red curtain, Christ-like. He initiates applause that an already impatient Claudius stops with a look and a gesture. He falls off the stage as if it were a cliff, making his voice recede, an echo of the fate Horatio feared he would meet by following the Ghost some days prior. Indeed, while we'll soon find out the Ghost wasn't lying about the murder, the play is the moment that truly embarks him on his doom. It will lead to Polonius' murder, his exile, subsequent return, and "all we mourn for". His falling off a cliff here makes that point. Kline also makes good use of his mime skills by sitting next to his mother on an invisible chair, as absent as their relationship.
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Claudius is a character to watch in this sequence, and not just because Hamlet has asked us to observe him. Brian Murray plays him fresh off the Nunnery scene, wary of what might happen, rather than, as it is sometimes played, seeing a turn for the better in Hamlet's passion for the theater. As the play begins, rather suddenly and without Prologue or dumb show (and yes, that means the brevity of woman's love isn't mentioned), Claudius gets somewhat lost in the story. The visual mirror makes Gertrude see herself in the Queen, of course, but mistakenly see Claudius in the King. In the background, she tenderly pets her husband, not seeing her forgotten former lord. Claudius is no less affectionate, though he does look in Hamlet's direction whenever the prince blurts out a line, trying to figure him out.
His other hand is on a drink, one we see him refill during the sequence (as Hamlet mentions poison, another visual irony). Playing on Claudius' weakness for alcohol goes a long way in showing how such a practiced politician could give himself away during this scene. He's had too much too drink and loses control. It's also interesting to see him puzzled at the title of the play, for indeed, why is it called that unless it ends with a Player Prince catching the murderer? Claudius might even think Hamlet has made changes to the play, and a clue exists in Lucianus switching from dagger to poison as he enters. One of the changes Hamlet has made? As the veiled accusation is UNveiled, Claudius drops his glass and stands, a gesture that shocks the assembly. Here, Kline creates a motivation for the otherwise redundant line "The King rises". The audience must be prompted to stand (as they must) because they've forgotten their manners in the wake of this incident. Chaos ensues as Claudius disentangles himself from Gertrude's kind ministrations, as she is part and parcel of the guilt he's suddenly experiencing.