ROSS. — DESIGN AS A SCIENCE. 



367 



We can extend or contract the scale of values, thus : — 



We can increase or diminish the degree of intensity, thus : — 



By these various modifications an infinite number of specific forms 

 of the system can be developed, all consistent with the system in its 

 abstract idea. 



If necessary, a system of half lights, half darks, and half intensities 



