单项选择题

Passage 2
Questions 13 to 15 are based on the passage you have just heard.
[听力原文]13-15
What we call the fine arts are considered to be painting, sculpture, literature, drama, music, dancing, and architecture.
Today, many curious experiments are being made in all the fine arts. But the traditional methods and products of the fine arts all have things in common. For one thing they have "design". Design can be with sounds, with stones, with words, with building materials, with lines, and paint. A work of fine art is designed. And within that design, the creator "rhythm", "balance", and "harmony".
Rhythm comes from the more or less regular repetition of similar sounds, colors, shapes, and movements. Balance is the arrangement of what the artist works with so that the result seems right to us. And harmony is putting things together that seem to belong together. These, of course, are only rough ideas of what a creator in the fine arts tries to do.

For one thing what do the fine arts have（）

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