The moving flag

Two men were arguing about a flag flapping in the wind.

“It’s the wind that is really moving,” stated the first one. “No, it is the flag that is moving,” contended the second.

A Zen master, who happened to be walking by, overheard the debate and interrupted them. “Neither the flag nor the wind is moving,” he said, “It is MIND that moves.”

~Zen Flesh, Zen Bones: A Collection of Zen and Pre-Zen Writings