The Matter of Air

Take a deep breath. Air—without it, life on Earth would cease to exist. Though not usually seen, its presence is relied upon. At once both ethereal and physical, air has been associated with flight and spirit, and yet it has progressively become a territory that can be claimed through communications, warfare, travel, and scientific exploration. At the same time, air is no longer a completely reliable part of our daily life: like water, it has become an environmental element that must be watched