The included odorants provide an olfactory introduction to the complex composition of essential oils. As essential oil enthusiasts, we are familiar with the complex perfection and roundness of the essential oil as the plant produces it. This fragrance of an essential oil is always the harmony achieved by combining many, even hundreds, of components in an inimitable fashion as only nature can do. Through the means of analytical chemistry, it became possible to learn which substances come together to make this harmony happen. The purpose of the olfactory toolbox is to give the reader a glimpse into nature’s composition strategy.