SPHERE, 1973, REPRINT. First published in 1963 by Ace Books, this is the second printing of the British paperback edition. A classic Philip K. Dick novel, this one involves a depopulated, post-apocalyptic earth. The remaining humans play a board game called "Bluff," and the outcomes determine marriages, status and property of the players. The Game is administered by amorphous, silicon-based aliens from Titan, Saturn's largest satellite.