"Unless you have synesthesia, you've probably never heard the secret music of melted mozzarella and pepperoni for yourself. But thanks to a new app, you can. Called Roy G Biv, this iPhone app will let you use the colors of the world around you and turn them into music.
Named after the acronym for the colors of the rainbow's spectrum, Roy G Biv is essentially a synesthesia synthesizer. By aiming your smartphone's camera at something--a book, a beer, a piece of furniture, a grape soda, whatever--Roy G Biv will use the object's dominant color as the basis for a single octave keyboard."
This text is from http://www.fastcodesign.com/3033213/turn-color-into-sound-with-this-this-synesthesia-synthesizer-app?utm_source=facebook