In synaesthesia, each person who has it has his/her own associated responses. So writing books to stimulate the taste or visual responses wouldn't work unless it was an electronic book which you could set up specifically with your own "dictionary of correspondences" before you read it.

Fun idea, huh?

Synesthesia

http://www.mudcat.org/thread.cfm?threadid=19884&messages=5

It came up in a thread in early 1999 but I can't remember the name of the thread.

Helen