I put it simple. The left side is home of the speech centre. It prefers to think in condensed and abstracted thoughts, in conceptions, words and numbers. The thoughts of the right side of the brain use the immediate sensual perception as images or sounds. It thinks holistic, intuitively and it is home of phantasy.
Drawing is a typical domain of the right brain.
The functions of the human brain a strongly determined by the requirements of culture, education, sex and a lot of others. Most people have developed a strong dominance of the left side thinking. We think in conceptions and our ideas are ideas, which we can write down in words. There is an astonishing consequence. Our brain tries to solve all ocurring problems with the means of the reasoning left side, even if they are the very own domain of the right, creative hemisphere.