They should become familiar objects in your home. Keep a globe or a map of the United States near the television and use it to locate places talked about on television programs, or to follow the travels of your favorite sports team. Very young children won't be able to fully understand globes, but they will become familiar objects. Point out signs that indicate location. In a store or other public place there will be entrance and exit signs, and signs that indicate stairs, escalators, and elevators.
Many signs use symbols.
Point them out and talk about them. In elevators or other places, show children how people with visual impairments use Braille signs. Look at videos or photographs of yourself and your children. Point out how much smaller everyone looks than they really are. A map is like a photograph.