You'll begin with four earth elements: Grass, Rock, Water, and Wood; all in perfect balance. But this perfect order will only last for a few fleeting moments as new elements spawn and existing elements change size, causing an imbalance in the world.
You have control over some of the elements, manipulating their size to try and keep the balance. Other elements, however, are beyond your control. A single tap will cause an element to grow, a double tap to shrink. Elements out of your control are manipulated by the universe, shrinking and growing randomly to bring a constant, changing disorder to the world.