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1.- The structure of the upper limbs of humans (size of hands, grip, etc), is widely different from one another, and in consequence, the movements of the muscles, is "imprinted " in the cerebral cortex, from a very early age (3-4 years)

The structure differences of fingers and hands have a wide range of variation in the studied samples this difference, brings also differences in the width and shape of the written letters by logic.

2.- The cerebral cortex (motor area), differs in impulses for drawing (the writing is a form of creating or drawing symbols) from one individual to the other. Apart from other structures that regulate fine movements such as the thalamus and cerebellum, that act as " regulators" of the fine movements of any human being.