These indivisible things were the forms, the truths that ground all that exists. Deconstruction attempts to undo the binary oppositions Platonic thought put into place. Rather than look at terms like right and wrong or good and evil as oppositions, deconstructionists would view them as supplements, terms that have no meaning without each other. Derrida makes these assertions about language from a structuralist perspective. For structuralists like Derrida, there is no necessary relationship between signifiers and things signified.
Language is created out of convention.
Language exists when a group of people agree concerning the relationship between a signifier and the thing signified. As noted, these conventions are arbitrary. But, they allow us to communicate. Derrida accuses Plato of logocentrism , the privileging of the word or the assumption that the word is the thing it represents. In breaking down binary oppositions, deconstruction also seeks to break down logocentrism.