A calm, rippling surface, though, is often interrupted by waves and splashes. Those waves and splashes are not singular geometric shapes. They are complex, temporary, and always unique. “One of the most important things is to use a variety of shapes,” says Case. “Big shapes and little shapes. Whether it’s water pouring onto something or water on the surface, you want to find ways of organizing small and large forms to make things look more organic.” Avoid uninterrupted lines. Straight lines are products of architecture and engineering, but natural shapes tend to bend, develop, and branch into other things. Wavy lines are more the norm, and if a single line continues unimpeded, add in something to interrupt it and make it more organic.
While you avoid straight lines and defined forms, remember the general shape and flow of your drawing. “All of these forms as they interact with each other are going to flow into one another,” says Case. “But the smaller ones are going to be superseded fairly quickly by the larger ripples.”