Over this period, Eco began seriously developing his ideas on the "open" text and on semiotics, writing many essays on these subjects. In 1962 he published "Opera aperta" (translated into English as "The Open Work"). In it, Eco argued that literary texts are fields of meaning, rather than strings of meaning; and that they are understood as open, internally dynamic and psychologically engaged fields. Literature which limits one's potential understanding to a single, unequivocal line, the "closed text", remains the least rewarding, while texts that are the most active between mind, society and life (open texts) are the liveliest and best—although valuation terminology was not his primary focus. Eco came to these positions through study of language and from semiotics, rather than from psychology or historical analysis (as did theorists such as Wolfgang Iser, on the one hand, and Hans Robert Jauss, on the other).