The stage directions show Otto's nervousness or anxiety by describing the way he acts and the expression on his face.
Stage directions are instructions in parentheses on a script of play that show how actors should move, how their gestures or facial expressions should look like, how their tone of voice should be, etc.
The stage directions we are analyzing here show nervousness, anxiety, or anticipation when it comes to Otto. They reveal he is constantly looking at the clock and he has a serious expression on his face. He is most likely nervously waiting for someone.
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