The physics of ephemera.

Our landscapes and the things that comprise them—folds, pebbles, dunes, meandering rivers, underground networks, etc.—are comforting in their immutability. And yet, at the level of the air and water that sculpted them, they are as ephemeral as gathering clouds, waves running through a field of wheat, or a candle's flame. Effervescent or unseen, these fluids shape our world. Here is a magnificently illustrated panorama of the forms they give rise to and physics in motion.