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Unity is the appearance or condition of oneness in a work of art.
Unity in art refers to the phenomenon when one element in a work of art is connected to another element or elements. Unity in art makes it wholesome, harmonious and pleasing to the eye. Unity in a work of art makes the viewer perceive it holistically rather than focusing on individual details. Attached are two examples of unity in artwork.
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I'd need the answer choices to see which one it is not.
Andrew is correct, because a thesis is the foundation for a topic. Your research will have 1 central thesis and within that you will explore different topics.