Against the Fall of Night Author:Arthur C. Clarke THE CHALLENGE OF THE UNKNOWN — Once Alvin had been content to share the pleasures of Diaspar, but now he knew that they were not sufficient. His horizons were expanding. That his life must be bounded by the walls of the city was intolerable to him. — His people's fear of the outer world was something he could not understand: to him it held no terr... more »or, but only mystery. When he was weary of Diaspar, the outer world called to him as it was calling now.« less