 Traditional and digital projection methods could not appear more different: the former involves running a flexible film strip through a mechanical projector; the latter involves a complex array of micromirrors on semiconductor chips, which, in combination with a prism and a lamp, generate projectable images from binary code. Nevertheless, both are methods for generating the impression of a continuously illuminated, persistent moving image from a sequence of static images. Compared with traditional projection, however, digital projection includes an extra step, whereby the images in the static sequence are generated from flashes of light. In order to generate each image in the digital projector, a light beam from a high-powered lamp is separated by a prism into its color components of red, blue, and green. Each color beam then hits a different Digital Micromirror Device (DMD), which is a semiconductor chip covered with more than a million tiny, hinged mirrors. Based on the information encoded in the video signal, the DMDs selectively turn over some of the tiny mirrors to reflect the colored lights. Most of the tiny mirrors are flipped thousands of times a second in order to create the gradations of light and dark making up a monochromatic, pixellated image—a mirror that is flipped on a greater proportion of the time will reflect more light and so will form a brighter pixel than a mirror that is not flipped on for so long. Each DMD reflects a monochromatic image back to the prism, which then recombines the colors to form the projected, full-color image. This image—if it were held for long enough on the screen—would be perceived as static. In order then to produce the impression of motion in the projected, full-color image, the underlying memory array of the DMDs has to update rapidly so that all the micromirrors are released simultaneously and allowed to move into a new “address state”, providing new patterns of light modulation for successive, slightly different images.