Imperial Earth (1975) is a saga about the colonization of the solar system. The thematic determinants of the novel are determined by extrapolations of scientific hypotheses related to interplanetary travel, and by the SETI program.
"Tales of Power" by Carlos Castaneda is the third book in the series about learning from Mexican shaman Don Juan Matus, which continues the exploration of the world of the nagual - a parallel reality accessible through special perception and discipline.