4. Folding fan
Folding fan is a similar concept to bellows; expansion and contraction. It folds itself to minimize overall size. It is used for cooling yourself. Several or scores of fine frames are pivoted and very stout Japanese paper or silk cloth is stretched over the framework. History of the fan is older than folding fan, but the Japanese may be the first people to have invented folding fan.
For expansion and contraction to provide best portability, folding fans had to be folded and how to fold the paper is also an essential element. Ways of folding paper through many years have been refined to a fine art known as “Origami (ori=fold, gami=paper)”.