ARCHITECTURE NATURE-ACTION 177 



him ; nor does the boy live in the same environment as 

 his father, even though he dwell with him in the same 

 household. 



This functional isolation, independence, and dis- 

 tinctive behavior of individual life is due to its distinc- 

 tive internal architecture. That is what, in effect, 

 limits and defines the content of its outer world, not 

 the presence, or absence, of things actually in it. In 

 other words, the sources of individuality are internal, 

 not external; and the infinite diversity of nature-life 

 lies primarily in its multitudinous variety of individu- 

 als, not merely in their environments. Therein lies a 

 special significance in numbers, giving to them some- 

 thing more than a mere summational quality. This di- 

 versity of life is based on the axiom that two things can 

 not occupy the same space at the same time; conversely, 

 no two individuals can be alike. The increasing di- 

 versity in individual life, which inevitably follows in- 

 crease in numbers, is a perpetual invitation to make 

 profitable usage of it. Only when the invitation is ac- 

 cepted, and cooperative action with qualitative sub- 

 division of labor takes place, does the possibility of 

 creating a higher life become a reality. 



Thus it is that an animal, like any other balanced 

 system of cooperative action may endure in a world 

 of many changes and yet take little or no part in them. 

 On the other hand by virtue of some apparently insig- 

 nificant internal readjustment peculiar to itself it may 

 move rapidly onward and upward leaving its fellows 

 behind in the old life and environment So chang- 

 ing, it may enter a new world without changing its 

 nominal habitat because these internal structural 

 changes bring it for the first time into cooperative re- 



