Mode series
（重定向自Virtual Mode）
The Mode series is a quartet of novels by Piers Anthony. Like many of Anthony's other fictional works, it explores themes of violence, the abuse of power, sexism and male dominance, gender roles, the environment, integrity and personal honor, sapient animal life, parallel and alternative evolution, space travel, alternate dimensions, paradox, obscure concepts in physics and mathematics, sexual assault and abuse, child and adolescent sexuality, and suicide.