The video “Sound Machines” on the YouTube channel MediaArtTube demonstrates a machine that uses light recognition to play sound. The machine has three sensors and takes in visual information from vinyl record sized discs with patters engraved. The three discs have different types of patterns which the sensors read. The first reads color, with the disk having red, yellow, and blue lines on a white disc, depending on where the sensor is located up or down the radius changes the sequence of colors, therefore changing the sound. The second disc reads either black or white, with 3 patterns made using a black disc hollowed out. When the sensor detects black is plays a noise. The final disk is split into thirds, where white becomes more and more grey. The sensor reads the grey scale and increases the volume the grayer the image gets.