S-DO (aspect of the relation sign-dynamic object)
It describes the relation between Sign and Dynamic Object. This is the typically representative trichotomy, when the sign relates to its dynamical object. The sign appears in this relation as the final interpretant allows it to do, that is, here the sign is already loaded with a type of purpose. When relating to its dynamic object, which is exterior to it, the sign might adapt, correct and accommodate the purposes that the final interpretant tries to perform through it. The relation S-DO is, therefore, the reactive confrontation between the tendency of the sign to perform a final cause and the indifference of the dynamic object to this finious purpose. If the final cause the sign pursues does not find resonance in the dynamic object, the representation will fail and the sign will remain a mere presentation (an icon of its dynamic object) and will tend to waste its signic power until homogeneity consumes it completely. If the relation S-DO is a Secondness, the sign has the possibility to represent its dynamic object materially, transmitting factual information about it. If the representation is a Thirdness, the sign incorporates the Form of the dynamic object and applies for being the vehicle of its transmission to an interpreter. If it is able to transmit the Form to the Interpreter with success, it will depend on the S-DI and S-FI relations.