Septimus Piess in his book The Art of Perfumery, drew a compelling parallel between musical tone and the "gamut of colors" exhibited by essential oils. He recognized how sound (musical notes), smell (fragrance) and color (as it relates to essential oils) could all be viewed as different types of vibrational waves, or qi. We might profitably draw an analogy here between the 45-octave frequency range of color associated with essential oils and a piano keyboard; however, the keyboard of this particular instrument, this pianoforte aromatico, this "Steinway of smell," would be almost eight times the length of that found in your living room. Additionally, in order to witness the gradual transition of color from the darkest to the palest oil, their olfactory "modulation," we would open our special piano and look inside. Each oil would then be represented by a unique string somewhere along this "sounding board" of fragrant color. - Ksana from Bookmarklet