Get used to two simple words if you have a child, ''What's That?'' You will hear it over and over and over again. If you are lucky they are pointing at something that you actually know – chair, hat, my sense of regret. Sometimes they will point at something that is not too familiar. Here the parental practise of making something up comes into play – it's a bird type thing. Books that show images of items, colours or animals may seem a little dull to an adult, but to a toddler learning about the world they are a who's who of what's that.