I like doodling on ruled paper because it provides some structure, like a trellis for a creeping plant. Often I will start out tracing over the lines, creating a rectangle or other geometric shape. At a certain point, it will give way to more a more organic form. In this case however, now that I examine it closely, it appears it was the other way around. The biomorphic blob was obviously drawn first, the incomplete rectangle providing a counterbalancing frame for its explosive energy.