The document discusses two distinct thinking processes - an analytical, verbal left brain and an intuitive, visual right brain. The corpus callosum connects the two hemispheres and allows them to communicate and work together, though each side specializes in different types of information processing. The left brain is described as positive, analytical, linear, etc. while the right brain is intuitive, spontaneous, holistic, etc. Optimal thinking involves exercising both variability by considering many approaches, as well as selection of the best approaches.