This book contains a symbolic model associated to the basic hardware function of the brain. A symbolic model is a model based on logic only. So, this book is not recommended to individuals who has the tendency to understand the external reality based on imagination. The book can be understand by persons between 12 and 20 years old who have special abilities in the field of positive sciences. Also, the book is recommended to persons who already work in the field of positive sciences (mathematicians, phisicists, engineers and so on).