Chinese Legend of the Great Flood
One of the legendary Five Patriarchs is Yu the Great. During a time of great floods in China more than 5000 years ago, Yu's father Gun worked for years to stem the floods by building dams to block the water. When his dams didn't hold, he got his head chopped off, and his son Yu inherited the job (poor guy!).
Yu worked for a decade to control the floods, but rather than making dams to block the flow of the water, he dredged channels to direct the flow of the water. After his great success, Yu was made ruler in tribute to his perseverance.
Acupuncture uses the ancient ideas of Yu: we release blocks in the currents of qi to give the qi somewhere to go when it is stuck.