CONTRARIES ARE THOSE THINGS THAT LACK RESEMBLANCE.
To begin with, resemblance does not mean only belonging to the same genus, nor mere confusion from more or less numerous characteristics, as, for instance, by their forms. Things that possess resemblance, therefore, are not opposites. Only things which have nothing identical in respect to species are opposites;[414] though we must add that they must belong to the same genus of quality. Thus, though they have no intermediaries, we can classify as opposites the things which betray no resemblance to each other; in which are found only characteristics which do not approximate each other, and bear no kind of analogy to each other. Consequently, objects which have something in common in the respect of colors could not be contraries. Besides, not everything is the contrary of every other thing; but one thing is only the contrary of some other; and this is the case with tastes as well as with colors. But enough of all this.