The water accumulated in the mountains flies down with a force that is enough to crush rocks, uproot trees and throw them into the stream, shake and break mountains, sweeping away everything in its path. But this force is not enough to cope with soft, gentle and moist air, the very air that is so easy to breathe, air that is transparent and compliant, invisible and free. This air, it turns out, has such forces that no rock, no water can compare with.