Smithsonian Report, 1963.— MacKay 



Plate l 



Common features of the "effective actions" shown here and in plate 3 illustrate the 

 generality of the cybernetic approach. Both involve "indication, calculation and selec- 

 tion," though in contrast to missile, chameleon's action is largely precomputed. Pre- 

 computed guidance is also used in mechanical systems. Photos from "Zoo Quest to 

 Madagascar," Lutterworth Press. 



