A very ingenious way to decode this book by Boudet!

We always focus intently on the map that Henri's brother, Edmond, constructed and contributed to La VRAI LANGUE CELTIQUE. I had wondered though, how the map relates to the words that Boudet wrote. Surely what the map conceals should be suggested in what Boudet wrote? The map might help you find it - but the actual words of Henri should tell you what it is. I recently came across some stunning work which  feel is worthy of serious consideration. I will present elements of the work below....