Very Simple Models, the Self-Modifying Automata and Chain of Self-Modifying Automata, Can Explain Self-Referential Properties of Living Beings

Very often, living beings seem able to change their functioning when external conditions vary. In order to study this property, we have devised abstract machines whose internal organisation changes whenever the external conditions vary. The internal organisations of these machines (or programs), are as simple as possible, functions of discrete variables. We call such machines self-modifying automata.