Throughout the ages, blue has been used to visualize something of our imagination, out of reach or divine. As a pigment, blue is extremely rare in nature, although it is found in the environment around us, from the calm light blue of a sky to the melancholy deep blue of an ocean. Unlike the particular reds, browns and yellows, the blue pigment cannot be created from materials within our reach. Without a doubt, blue represents a completely new world beyond ours.