In Ancient Greece, Aristotle formed the first known theory of color. He theorized that seven colors show up in the middle of black and white. He considered blue and yellow to be the true primary colors, he watched (the way light changes throughout the day, so the white light of noon becomes tinged with yellow, changing to red. It turns to purple after the sunset. Then it change to night sky of dark blue. And the green appear somewhere between them. Afterward it transform to night sky for dark blue. And the green show up somewhere between them. In the 16th century Leonardo da Vinci in the 16th century Leonardo da Vinci was the first to suggest an alternative hierarchy of color. He said that while philosophers seen white as the "cause, or the