People who know a lot about child development say that a child's mind is very stimulated by pictures. That is why every child should possess at least one good picture book. Picture books of any given animal life is always a good option for imagination-building purposes. Pictures of spiders in particular almost defy it. There are such a vast variety of the many-legged little monsters. Almost alien-like an image of the creature can stay with a youngster for years and years.