﻿Plate 
  83.— 
  Inca 
  architecture. 
  Top 
  (left) 
  : 
  Agricultural 
  terraces 
  at 
  Inty 
  Pata. 
  

   (Courtesy 
  Paul 
  Fejos.) 
  Top 
  (right): 
  Polygonal 
  wall 
  in 
  Cuzco, 
  supporting 
  mod- 
  

   ern 
  buildings. 
  (Courtesy 
  Grace 
  Line.) 
  Bottom: 
  A 
  wall 
  at 
  Chachabamba. 
  

   (Courtesy 
  Paul 
  Fejos.) 
  

  

  