A Zen Master and his three disciples were once meditating by the side of a river. There was a flag (on a pole) nearby that was fluttering in a strong wind. The novice visibly disturbed remarked, “The flag is flapping.” The junior monk smiled on hearing this, and with his eyes closed, replied, “The wind is flapping.” The senior monk on hearing this, retorts, “The mind is flapping.” The Zen master visibly annoyed: “Mouths are flapping.”