"In the absence of any written analogue to speech, the sensible, natural environment remains the primary visual counterpart of spoken utterance, the palpable site, or matrix wherein meaning occurs and proliferates. In the absence of writing, we find ourselves situated in the field of discourse as we are embedded in the natural landscape; indeed, the two matrices are not separable. We can no more stabilize the language and render its meanings determinate than we can freeze all motion and metamorphosis within the land."