Since ancient times, color theorists have developed ideas and interpretations of color relationships. Attempts to formalize and recognize order date back at least to Aristotle (384-322 B.C.E) but began in earnest with Leonardo da Vinci (1452 – 1519) and have processed ever since. Leonardo noted that certain colors intensify each other, discovering contrary or complementary colors. The first color wheel was invented by Britain's Sir Isaac Newton (1642-1727), who split white light into red, orange , yellow , green , blue , indigo and violet beams, then joined the two end of the spectrum to form a circle showing the natural progression of colors. When Newton created the color wheel, he noticed that mixing two colors form opposite position produced a neutral or anonymous colors.