I don't see how it was similar. The Sprawl is the megacity in William Gibson's distopian cyberpunk novels. sanchin is the principle philosophy of Okinawan karate, originating with the Shaolin Monks. But if you can see the similarity, well done!

PS I have sanchin tattooed on my arm. I rode my Suzuki Marauder down from my camp near the Katadins to Bangor and had the ink done. :)