The Sandhills region of Nebraska is a paradise for nature lovers. Covering one quarter of the state, it consists of dunes, some reaching 300 feet high, along with grasslands, and shallow lakes. A driving tour through the Sandhills, often described as one of the most scenic in the USA, is a great way to explore the area.
opponent(Noun) An individual or group who is a rival of another. opponent(Noun) One who attempts to stop the progression of. opponent(Noun) One who objects to. opponent(Noun) In team sports, a player of an opposite team.
From this observation, he proposed opponent-process theory, which states that we perceive color in terms of opposite ends of the spectrum: red to green, yellow to blue, and white to black. It is through this theory that we can explain afterimages, or when we keep seeing the same image after it's vanished.