A kite flying over the Namsan Park in Xining

Kites were used approximately 2,800 years ago in China, where materials ideal for kite building were readily available: silk fabric for sail material, fine, high-tensile-strength silk for flying line, and resilient bamboo for a strong, lightweight framework.
When you walk in the Namsan Park you can observe kite fightings at the sky, one tries to crash down an other one, the kite string is fixed with glass splinter to cut off somebody others line.