First secure some geometrical figures. Take for example a five-pointed
star, have the child look at it carefully, then close his eyes and
reproduce its form and size in a clear, visual picture. Let him
look at the drawing and see if he can improve the clearness and
definite proportion of his mind's eye picture. Now have him take a
sheet of paper and draw this picture as he sees it in his mind, and
when complete compare it with the original for accuracy in size and
proportion. Let him close his eyes several times and get just as
definite a mind's eye picture as possible before he attempts the
drawing of the figure. Practice with figures of this kind, gradually
increasing their complexity.