Isaiah 40-55 deconstructs in that (for instance) it both asserts that everything depends on God and that everything depends on the audience's response to God. It is mystifying in that it is often characterized by ambiguity rather than univocity. It is intertextual in that it takes up motifs from Isaiah 1-39, with which it then has a two-way relationship. It is socio-historical in doubtless serving the interests of its community, though that community cannot securely be identified. It is hearer-involving in that it demands and depends on its audience's response.