which with the aid of magically potent pictures, the 
     sacred rituals could be performed.

          These caverns possess no space in our meaning of 
     this word, for in them perpetual darkness reigns. The 
     caverns are, spatially speaking, empty. This is well 
     appreciated by anyone who has tried alone to find his way 
     out from one of them. The weak beam of light from his 
     light torch is swallowed up by the absolute darkness 
     around him, while rocky tunnels and crumbling slopes 
     repeat themselves in every direction and re-echo his 
     question: where is the outlet from this labyrinth?

          Light and the Art of the Caverns 

          Nothing is more destructive of the true values of