The second feature to note is dimension. Normal chaildren tend to make two-dimensional representations of objects in a canonical' format and then add any salient features. In other words they have a basic representational format for a person or a houseora ship or whatever and then add on particular details that specify that particular view of the person, house, or ship. It is only much later that a child is prepared to deform its canonical representation. Most people indeed continue to make canonical representations throughout adult life. The anomalous draughtsman on the other hand is quite prepared to draqw from a single viewpoint and does not seem concerned at all about the ambiguity that might result from something that is assumed to be of concern to the normal child artist.