Nowadays, what instrument do we use to clarify ourselves in a changing environment? Do not tell me, from the beginning, that the most comfortable solution is not to change your mind and always keep the thought inherited or acquired. When everything changes, the easiest way to remain unhappy is to never change our way of being or thinking. This evidence is taken for granted. At other times, we point to the fact that it all begins with an inaccurate external world perception, which we then try to complete with the help of memory and our ability to learn. The uncertain perception is sustained by physical phenomena about which we still know little.