In music they are the major and minor modes: the typical, or representative chords of the dominant seventh, and of the tonic (the two chords into which Schopenhauer says all music can be resolved): a partial dissonance, and a consonance: a chord of suspense, and a chord of satisfaction. In speech the two are vowel, and consonant sounds: the type of the first being _a_, a sound of suspense, made with the mouth open; and of the second _m_, a sound of satisfaction, made by closing the mouth; their combination forms the sacred syllable Om (_Aum_). In painting they are warm colors, and cold: the pole of the first being in red, the color of fire, which excites; and of the second in blue, the color of water, which calms; in the Arts of design they are lines straight (like fire), and flowing (like water); masses light (like the day), and dark (like night). In architecture they are the column, or vertical member, which resists the force of gravity; and the lintel, or horizontal member, which succumbs to it; they are vertical lines, which are aspiring, effortful; and horizontal lines, which are restful to the eye and mind. It is desirable to have an instant and keen realization of this sex quality, and to make this easier some sort of classification and analysis must be attempted. Those things which are allied to and partake of the nature of _time_ are masculine, and those which are allied to and partake of the nature of _space_ are feminine: as motion, and matter; mind, and body; etc. The English words "masculine" and "feminine" are too intimately associated with the idea of physical sex properly to designate the terms of this polarity. In Japanese philosophy and art (derived from the Chinese) the two are called _In_ and _Yo_ (In, feminine; Yo, masculine); and these little words, being free from the limitations of their English correlatives, will be found convenient, Yo to designate that which is simple, direct, primary, active, positive; and In, that which is complex, indirect, derivative, passive, negative. Things hard, straight, fixed, vertical, are Yo; things soft, curved, horizontal, fluctuating, are In--and so on. [Illustration 6: WILD CHERRY; MAPLE LEAF] [Illustration 7: CALLAS IN YO] In passing it may be said that the superiority of the line, mass, and color composition of Japanese prints and kakemonos to that exhibited in the vastly more pretentious easel pictures of modern Occidental artists--a superiority now generally acknowledged by connoisseurs--is largely due to the conscious following, on the part of the Japanese, of this principle of sex-complementaries.