813. Now that we have established that our experience of life can exist only as a sense of "I" and "it", and that the "I" constitutes "that which experiences" while "it" constitutes "that which is experienced", we have as a result become acquainted with the very foundation on which all "life substances" are based and without which they would be an impossibility. As the "I" constitutes "that which experiences", it is absolutely necessary that it is separate from "that which is experienced". In order that something can be experienced, it must find an outlet in a reaction, which means it must find an outlet in the contact of two energies with each other. Every experience or every kind of sensory perception must therefore be energy or movement. But as the I constitutes "that which experiences", it cannot in essence be identical to reaction, energy or movement. And it is not so surprising that it will always appear in the sensing of life as a "blind spot"; it will always be an "X". The very fact that it cannot be sensed remains, for the researcher, one of the strongest proofs of its eternal existence as the "fixed point", from which we can sense, classify and separate all the things that can be sensed with our senses, that is to say, all "life substances". Without the acknowledgment of this "fixed point", "cosmic analyses" could not possibly exist. Every view of consciousness, every acknowledgment of life, would have to be a relativity, which means that it would have to be content with being merely an ascertainment of the reaction of certain movements with other movements, this ascertainment being the same as the knowledge we know today as the results of weights and measures or as material science.