Logic in its widest sense he identified with semiotics, the general theory of signs.
Goodman, like many others, seeks the nature of art in symbolism and the nature of symbolism in a general theory of signs.
According to Goodman's general theory of signs, the relation between signs and the world can be described, like any relation, in terms of its formal structure, the objects related, and its genealogy.
Actual "indexical" proof of presence, as in a photograph, was separated from painting or, for example, the Twitter icon on your phone (Charles Peirce's theory of signs); content disjoined from form (Erwin Panofsky's "iconology").
In a prolonged effort to embed this analysis of doubt and inquiry within a more comprehensive theory of signs in which communication, thought, knowledge, and intelligent conduct could be fully understood, Peirce achieved a wealth of original insights.
A member of the Institut de France (1795), Sicard wrote two important books: Mémoire sur l'art d'instruction les sourds-muets de naissance (1789; "Memoir on the Art of Teaching Deaf-Mutes from Birth") and Théorie des signers pour l'instruction des sourds-muets (1808 14; "Theory of Signs for the Instruction of Deaf-Mutes").
Peirce's theory of signs is complicated.
(See the entry on Peirce's Theory of Signs).
For Peirce, developing a thoroughgoing theory of signs was a central philosophical and intellectual preoccupation.
(See the entries on Charles Sanders Peirce and Peirce's theory of signs).
