Henning’s odor prism
a prism-shaped graphic representation of six primary odors and their relationships. Burnt, spicy, resinous, foul, fruity, and flowery are the primary odors that occupy the corners of the prism, and each surface represents the positions of odors that are similar to the primaries at the corners of that surface. Also called Henning’s smell prism. [Hans Henning (1885–1946), German psychologist]