Vast alien machines are constantly at work above our heads. We need only to look
up to see them. If we do, and we look carefully, we will see the most diverse range
of natural forms and shapes outside of a tropical rain forest.
Dangerous as they may be, most of the life on this world could not survive without
them. This is nature in its purest form, just water, air and the effects of temperature.
These behemoths have been around since before the dawn of humanity in their endless
task of transporting water across the planet.
Equally interesting are the clouds that we create ourselves with our jet aircraft
flying through the sky. We think nothing of it when we fly off on our well deserved
holidays, but just look at what we are leaving behind us in the sky.