Translates as viewing the sky. Supposedly gets it name from the opening move making a circle with both hands. Northern Shaolin in origins, its from the Chinese system of martial arts again supposedly brought over by visiting officials to Okinawa. In Shingo Ohgami book Karate Katas of Wado Ryu he likens Kushanku to the Chinese system with various combinations of turns, jumping with explosive release of energy. The longest kata in our system with the most exchange of differing stances. In this kata the execution of the techniques has to be done with the right exchange of tension and relaxation to be able to maintain the flow.
“The Art is the Flow the Flow being the Art”