For to get an expression for what is indefinable in the mental state accompanying a particular representation and to make it universally communicable whether the expression be in language or painting or statuary is a thing requiring a faculty for laying hold of the rapid and transient play of the imagination, and for unifying it in a concept (which for that very reason is original, and reveals a new rule which could not have been inferred from any preceding principles or examples) that admits of communication without any constraint of rules.