Re-enactment of rebels' arrival in Havana 50 years ago

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What do you think the phrase 'Look here' implies in a conversation?

In what contexts might someone use the phrase 'Look here'?

How does the tone of voice affect the meaning of 'Look here'?

Can 'Look here' be considered a directive? Why or why not?

What emotions might be conveyed when someone says 'Look here'?