Answer:
The term perspective refers to the representation of objects in three-dimensional space on the two-dimensional surface of a picture.
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The twelve-tone system of composition was invented by Arnold Schoenberg. The twelve-tone technique is a term referring to a type of musical composition that came to replace the old basis of tonality and contribute a new musical structure. This technique involves the use of tone rows, ensuring that all twelve notes are heard without any emphasis on a specific note.