The ego-instinct makes one think of oneself. And while this self-concentration appears first as selfishness, as egotism, as setting oneself above and against others; in its development it leads further. It leads to withdrawing from others, in order to brood, to study, to develop the imagination. It leads to introverting, going into oneself. It was this type then that produced the first shaman and medicine-man. For in order to give birth to art, or philosophy, or discovery and invention, one must seclude oneself from others, and enter the world of the imagination. Naturally, the introvert in the savage tribe felt himself different from others. He was not concerned with activity, with hunting, fighting, mating, having children; he was concerned with his own ideas and emotions, with the pictures that loomed up in his mind and which he felt compelled to scratch out on stone or bone; with an unseen world which he saw as one of gods and demons; with religion and invention. The tribe doubtless thought him strange and abnormal; but not necessarily effeminate. He secured his place by the results he produced, so that, in the common mind, he became linked with the supernatural. In fact, up to very recent years, the world held as more or less sacred its religious leaders and artists, its doctors and great students. The introvert dreams the future which the extravert lives. Our whole structure of civilization, with its sciences, its arts, its inventions, and even its manners and habits, was built up by extraverts who made use of the great discoveries of introverts. It may be seen at a glance that the problem of sexuality differs for the two types. If the extraverted, or active, type is rooted in the sexual-instinct, naturally it is the more sexual type; whereas the introverted type, rooted in the ego-instinct, is less so. However, we must remember that the types are rarely pure; both instincts exist in every one of us, only in the extravert the one is accented, in the introvert, the other. But quite aside from the problem of type, there is the problem of bi-sexuality. To Jung this is a mental and emotional matter, rather than a physical. In other words, just as in all of us exist the ego and sexual instincts, just so there exist in all of us the masculine and feminine _principles_. In the recent fight for Women’s Rights, there were those women who enlightened us by saying that men and women are fundamentally alike, that there must be a single standard of morality or immorality, that women could do the work of men, etc. On the other hand, the so-called he-men of America are fond of affirming that they are red-blooded and masculine through and through. Neither of these statements can bear much scrutiny. According to Jung, the masculine and feminine are not only opposing physical structures, but opposing principles. The masculine tendency is to _spend_, the feminine to _retain_. This may be seen in the sexual act itself.