The interpretation of man which I have defended in my book, Theory of Man, agrees with the Linnaean designation of homo sapiens, which is more exact, in my opinion, than the classical one of “rational animal.” In that work I maintain that what is peculiar to man is that he is conscious of a reality outside of himself and of his own intimate being, or, in other words, that he recognizes the independent existence of the world and is an ego. Both matters can be reduced to a unique primary function: the objectifying activity, which in normal, continuous, and accumulative operation belongs only to man, and from which all essentially human traits are derived. The peculiar characteristic of perception properly so called, that is, human perception, is the observation of things that are present, the recognition that a given thing exists. To perceive, then, is to attribute presence or existence to what is perceived, to admit it as an object existing by itself, certainly in different ways according to whether it is a question of external things, of the subjective entity, or of the processes and “states” inherent in it; let it be noted that when perceptive attention fastens upon the “states,” that is to say, on subjective, unintentional processes like those of coenesthesia which ordinarily are not perceived but are lived, enjoyed, or suffered, these become objectified without losing in themselves their condition of states. The capacity to objectify is the bedrock of human nature; animal conscience (if it deserves this name) must be imagined, save for rare exceptions, to be a succession of “states” to which objectifying attention is not applied because such attention can only come from an ego.