A notion developed within primary metaphor theory. Relates to the observation that highly schematic elements of conceptual structure are shared by the primary target concept and the primary source concept in a primary metaphor giving rise to superschemas. For instance, in the primary metaphor difficulty is heaviness, the superschematic structure that is common to both target: difficulty, and source: heaviness, is that of a scalar relation. Similarly, what is common to the primary target and source concepts in the primary metaphor anger is heat is the superschematic structure of being an unbounded entity.