It flows with gravity, slowly, quietly or faster with great force, depending on the incline of the plane over which it moves. Wind moves water in gentle ripples or as huge powerful waves that destroy everything in their path. Water may be controlled by the environment and contained within natural boundaries - as while meandering slowly down a quiet river between meadows and trees. Or it may be a raging torrent in a stony mountain gorge producing plumes of white froth. Water provides us with energy, transportation, recreation and aesthetic experiences.
Fountains contain and control moving water.
They may function practically to purify water. They have, as well, an aesthetic function. In VR space, an avatar's proximity turns on both real and virtual fountains.