public Eye(Brain brain) : base(brain) { }
public Leg(Brain brain) : base(brain) { }
public BodyPart(Brain brain) { _brain = brain; }
public Hand(Brain brain) : base(brain) { }
public Ear(Brain brain) : base(brain) { }
public Face(Brain brain) : base(brain) { }
public Arm(Brain brain) : base(brain) { }
public Stomach(Brain brain) : base(brain) { }