How does Jeanette Winterson use imagery in Written on the Body?

Imagery:

"Written on the body is a secret code only visible in certain lights; the accumulations of a lifetime gather there. In places the palimpsest is so heavily worked that the letters feel like braille. I like to keep my body rolled up away from prying eyes. Never unfold too much, tell the whole story. I didn't know that Louise would have reading hands. She has translated me into her own book."