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A light material such as paper, plastic, metal plate, thin wooden plate is hung with threads and bars, and balanced at a specific position to be stable. Since each member is suspended at only one place, it is easy to rotate, and if it is shaken by the wind or the hand of a person, it changes to a form which is difficult to predict complexly. Although it has high value as a work of art, many inexpensive items are used as interior and educational toys. ...