"The Mind of a Mnemonist is a rare phenomenon - a scientific study that transcends its data and, in the manner of the best fictional literature, fashions a portrait of an unforgettable human being.
I am at loss of words to describe the book, for a few hundred words cannot describe the vastness of S's mind, but hats off to Luria, I enjoyed (and still do enjoy)the book from cover to cover.
A R Luria's "The mind of a mnemonist: A little book about a vast memory" is an excellent book indirectly about synaestheisa.
the subject 'S' had a memory that was for all practical purposes inexhaustible. part of the reason for this was because he was very highly synaethetic, colours had texture, smell & emotional associations. numbers had tastes and tones, etc.. his whole world was a rich mass of interacting sensory experience.
it made even the most mundane things extremely vivid and helped him remember practically everything.. not that it helped him, he was an unassuming, unremarkable and unhappy man. (there's probably a lesson in there somewhere, but i've already forgotten what it is.)