The environment is the less important in the moulding of character, the less fixed and unavoidable it becomes. If an individual has the chance to change his environment to suit his own original demands and interests, these are the less likely to undergo modification. This is illustrated in the animal world by the migratory birds, which change their habitations with the seasons. Similarly human beings, to suit the original mental traits with which they are endowed, can and do exchange one environment for another. There are a very large number of individuals living in New York City, in the twentieth century, for example, for whom a multiplicity of environments are possible. The one that becomes habitual with an individual is a matter of his own free choice. That is, it is choice, in the sense that it is independent of the circumstances of the individual's life. But an individual's choice of his environment must be within the limited number of alternatives made possible by the original nature with which he is endowed. As pointed out in connection with our discussion of "Instinctive Behavior," we do originally what gives satisfaction to our native impulses, and avoid what irritates and frustrates them. We may be trained to find satisfactions in acquired activities, but there is a strong tendency to acquire habits that "chime in," as it were, with the tendencies we have to start with. There is, for example, to certain individuals, intrinsic satisfaction in form and color; to others in sound. To the former, pictures and paintings will tend to be the environment selected; to the latter the hearing and the playing of music. To those gifted with sensitivity in neither of these directions, pictures may be through all their lives a bore, and a piano a positive nuisance. These facts of original nature, therefore, determine initially, and consequently in large part, what our environment is going to be. Once we get into, or select through instinctive desires, a certain kind of environment, those desires become strengthened through habit, and that environment becomes fixed through fulfilling those habitual desires. A man may, in the first place, choose artists or scholars as companions because his own gifts and interests are similar. But such an environment will become the more indispensable for him when it has the reinforcement of habit to confirm what is already initially strong in him by birth. "To him who hath shall be given" is most distinctly true of the opportunities and environment open to those with native gifts to begin with.