LinkBasis of associationIllustration
RationalIntelligible identity, likeness or correlationTeacher and pupil
EstimativeOpposition or perceived oppositionBlackness and whiteness
ImaginativeAssociation developed through habit or repeated conjunctionRain calling up the smell of wet earth
These categories describe relations between concepts, not grammatical case endings. Their application depends on the meaning of the discourse and the listener's conceptual associations.