In one-point perspective, what is the line called that separates the ground and the sky?

The horizon is the line that separates the Earth from the sky. Some of the best places to see the unobstructed horizon are beaches, where the ocean meets the sky in an uninterrupted line.

 Explain:                                                                                                                                    

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name the above painting and its artist. how has the artist used balance, variety, and movement in this piece to emphasize the man waving the cloth, in the upper right-hand corner? be specific in your response.