Life cannot do this easily, but has to adapt itself to the resistance of the downward flow. It does this through its motor reactions, its sense organs, and above all through its intelligence when that is evolved. The evolution of these things gives us our ideas of space. The insect cuts up its environment into spatial forms easy for it to deal with. Man with different sense organs probably lives in a different space world. As "a thing is where it acts," it is obvious that the boundaries of things in the material realm would be quite different if we had, for example, some sort of sense organ adapted to identify things by their electrical properties. But this identifying of things by spatial and material concepts--the mathematical order--is instrumental to the ends of action, and the original consciousness of life, while it included the potentialities of intellectual knowledge, was instinctive. Instinct, according to Bergson, is first-hand knowledge, but knowledge incapable of conceptual extension. It is therefore no use in the practical affairs of life, but certain and immediate in its apprehension of the actual flow of life itself. In its broadened form of intuition it is responsible for all the valid and original insights of the philosophers and poets. The structural and dialectic forms in which philosophies have been given to the world are simply the intellectualizing process which philosophers have used to buttress--and which they have often thought produced--the insight which was prior to and independent of the system.