A perfumer is an expert on creating perfume compositions, sometimes referred to affectionately as a nose (French: nez) due to their fine sense of smell and skill in producing olfactory compositions. The perfumer is effectively an artist[1] who is trained in depth on the concepts of fragrance aesthetics and who is capable of conveying abstract concepts and moods with compositions. At the most rudimentary level, a perfumer must have a keen knowledge of a large variety of fragrance ingredients and their smells, and be able to distinguish each one alone or in combination with others.