Semiotic Perception and Dynamic Forms of Meaning

What do we mean by semiotic perception ? Why should the concepts of perception and expressivity be reinterpreted within the encompassing framework of a dynamic theory of semiotic fields and forms?  Can we redeploy the concept of form in such a way as to make explicit such a native solidarity (‘chiasmatic’ would have said Merleau-Ponty) between perception, praxis and expression -- and first and foremost in the activity of language, right to the heart of the life of the social and speaking an