His use of space evolves from symbols floating around on a page to symbols touching a baseline. At this age the placement of objects drawn on a page are explored. The child is developing an order to his symbols just as he is developing an order of letters, words, and sentences. This age marks the difference of boy and girl preferences of what they want to create in art. Girls may prefer to draw flowers and houses.
Boys often prefer the more mechanical types of drawing, like cars.
At this stage the child has grown in his understanding of his world and this is what he likes to communicate through his art. This is a different twist on a drawing activity. You will need a fairly heavy piece of paper and chalk. First dampen the paper with a wet sponge. Make a drawing using chalk.