Robert Lee began to reflect upon a revolving two-dimensional mental image. Starting with an imaginary plane, he began to manipulate and rotate it in his mind. He mentally stretched, torqued, expanded, and squeezed the two-dimensional plane until a three-dimensional form developed. Calculus acted as a sort of catalyst in his thought process as he developed a concept for re-created paintings. In fact, integration can be used to find the areas of plane regions with [f(x) Ð g(x)] dx, and the volumes of solids of revolution and volumes by slicing based on the formula A(x) dx. So he took this notion of revolving two-dimensional planes and he thought of a plan to make tangible images. The result was beautiful holistic paintings in monochromes.