Size of the boat?  Motion of the ocean?

Join in as The Gang investigates Mumon's bold move when he says the 6th Patriarch himself was wrong when he told the men debating some Newtonian Physics that neither the flag nor wind moved: it was your mind that moved.

If a plane's wings are shaped to make the air going over the top move faster than on the bottom, why can they fly upside down??

Welcome to the Sangha.