The possibilities of synesthesia in relation to language & words: The word & the letter as sensations, colors evoked by letters, sensations caused by the sound of a word as apart from its meaning, etc. And, the effect of this phenomenon on you, for example, write in the water, on a moving vehicle.
Attempt writing in a state of mind that seems least congenial.
Consider word & letter as forms -- the concretistic distortion of a text, for example, too many o’s or a multiplicity of thin letters (lllftiii, etc).
Consider (do) memory experiments (sensory) in relation to writing: for example, record all sense images that remain from breakfast; study which sense(s) engage you, escape you.
Write, taking off from visual projection, whether mental or mechanical, without thought to the word (in the ordinary sense, no craft). Write in the movies, etc.
Make writing experiments over a long period of time: for example, plan how much you will write on a particular work (one word?) each day, or, at what time of a particular day (noon?) or week, or, add to the work only on holidays, etc.
Write on a piece of paper where something is already printed or written, as, in your favorite book of prose or poetry (over the print, in the white space).