515. It is the living being's primordial desire, or inner attraction to life, that causes it to be conscious of its interaction with the surrounding energies, the process we call "life". This primordial desire increases steadily, causing the being to desire contact with a whole range of energies which are not strictly necessary to its present bodily form or consciousness. The living being has no previous knowledge of these unfamiliar energies. Therefore, its interaction with them brings about, for the being in question, correspondingly quite new, unknown reactions, some of which are "pleasant" and some "unpleasant". We call these new reactions, "experiences". These reactions again bring about new "longings", the fulfilment of which creates further new empirical experiences of the "pleasant" or the "unpleasant", and so on continuously. In this way the area becomes larger and larger. Whereas formerly, in the mineral state and the vegetal or plant state, the being conveyed its physical appearance absolutely automatically, now, in its "brute-like" or "animal" state, it conveys it over an ever larger and larger area as conscious, willed experience. It is for this reason that its consciousness becomes divided into the two areas mentioned before – "day-consciousness" and "night-consciousness". "Day-consciousness" consists of that area of consciousness which is directed with awareness by the will, while "night-consciousness" is the area of consciousness which is led automatically and unconsciously. The individual expresses all conscious interaction with the energies through this "day-consciousness". All reactions take place here. And this interaction and these reactions are the being's "thought-function", which is the same as its conscious experience of life.