If all the colors that our eyes can perceive are to be considered as frequencies of visible light, then violet has the highest frequency of them all, beyond which is invisible ultraviolet light. It was only natural to pair this intense, energetic color with the highest-frequency chronograph in regular production, the Zenith Defy 21. In past centuries, violet was coveted as the most sought-after color dye for garments, the production of which was a closely held secret by certain civilizations such as the Phoenicians.