Definition
Jean Carles, who founded the Grasse perfumery school in 1946, systematized the pyramid as a teaching framework mapping molecules onto a rough volatility hierarchy. Hesperidic and aldehyde top notes evaporate quickly; floral and spice heart notes reveal themselves as the top dissipates; base notes including musks, resins, woods, and fixatives persist on skin for hours. Earlier, William Poucher's 1923 system of evaporation coefficients had introduced a related concept.
The pyramid is a simplification, not a physical law. Molecules overlap in time; some base materials are detectable from the opening. Several perfumers explicitly reject the model: Jean-Claude Ellena describes his compositions as watercolors, structured horizontally; Mathilde Laurent refers to a cloud; Escentric Molecules' Molecule 01 (2006, Geza Schoen) demonstrates a single-note linear structure that bypasses the pyramid entirely.
Niche examples
- Classic pyramidal logic: Jicky (Guerlain, 1889, Aimé Guerlain), often cited as the first composition with explicit pyramidal structure: bergamot top, lavender-coumarin heart, vanilla-civet base.
- Non-pyramidal niche: Musc Ravageur (Frédéric Malle, 2000, Maurice Roucel) develops almost entirely in the base register, functioning as a linear composition.
Not every house writes in pyramids. An organist, Filippo Sorcinelli publishes for each perfume a harmonic evolution in three movements borrowed from fugue writing, a subject, a counter-subject and a tail. The three words name roles in the composition, not durations on the skin, so they do not necessarily match the top, heart and base.