Theoretical texts such as Downing's naturalized a discipline's autonomy and self-referentiality by employing internal languages, building on past precedent, and constructing meaning in formal relationships. The codes, principles, and convention that are described and analyze in such texts from the basis of languages of design construction and criticism. These ''theories from within'' are usually aimed at an audience of makers or designers who will build or construct new works upon the foundations of other. Theories from within are significant contributions to the evolution of specific field of cultural production like landscape architecture because they permit a shared language which facilitates discourse and criticism from within.