All the questions raised here are combined by the fact that they are all in varying degrees relate to various aspects of being - from physiology to the phenomena underlying worldview, shaping our attitude towards reality. This concerns not only in nerve pulse propagation, color perception, etc. In particular, interest in cryptography from people other than narrow specialists, is associated with frequent reference to it in connection with the awareness of some of the problems relating to, for example, the interpretation of certain obscure passages of the Bible. Moreover, in some religious and philosophical systems reality itself is treated as an encrypted message.