"There are four kinds of instruments here, Wilmarth," whispered the voice. "Four kinds—three faculties each—makes twelve pieces in all. You see there are four different sorts of beings represented in those cylinders up there. Three humans, six fungoid beings who can’t navigate space corporeally, two beings from Neptune (God! if you could see the body this type has on its own planet!), and the rest entities from the central caverns of an especially interesting dark star beyond the galaxy. In the principal outpost inside Round Hill you’ll now and then find more cylinders and machines—cylinders of extra-cosmic brains with different senses from any we know—allies and explorers from the uttermost Outside—and special machines for giving them impressions and expression in the several ways suited at once to them and to the comprehensions of different types of listeners. Round Hill, like most of the beings’ main outposts all through the various universes, is a very cosmopolitan place. Of course, only the more common types have been lent to me for experiment.