"El Hombre Mediocre: Ensayo de psicologia y moral" by José Ingenieros is a philosophical essay published in 1913. This work examines human nature by categorizing people into three types: the inferior man, the mediocre man, and the superior idealist. Ingenieros contrasts those who blindly follow routine and tradition with visionaries who use imagination to pursue higher ideals. The book explores how these personality types shape science, society, and culture, ultimately championing the individualist idealist over the conformist mediocre man.