The complex plane is colored using a spectrum of colors to denote the argument of a point, and shading to denote the modulus. The origin is black, infinity is white, and positive numbers are red. The colors cycle through red, yellow, green, cyan, blue and magenta. Computers use mixtures of red, green and blue (RGB) on their screens, printers use mixtures of cyan, magenta and yellow, and black (CMYK).
