An interesting article. Two things: Vladimir Nabokov writes in his memoir Speak, Memory about his synesthesia where he associates different letters with colors; Saussure also left MSS behind in which he found numerous anagrammatic patterns in Latin poetry. (There is a book about the latter translated in '79 called Words Upon Words: the Anagrams of Ferdinand de Saussure by Jean Starobinski.)

Ceci n'est pas un seing.