Produced in 1980, this little book appeals to the imagination and is of interest to the Celtic artist on many counts, not least its originality of concept and technique, drawing upon themes common to all the Celtic populations of Europe and illustrating these themes in a variety of new treatments.

The title of the book is Cornish for 'Black and White Book'. As the artists explain in the foreword, this 'Black and White Book' has everything to do with the black and white of St. Piran's banner, the national banner of Cornwall. The name also alludes to the graphic style of the designs themselves, done in line and point. 

"[Lyver Gwyn Ha Du] is a try-out of the possibilities, varieties and symbolism of timeless Celtic art, of her adaptations and her originality, the use of which we like to see progressing with all our hopes. Our intentions are to promote Celtic art, styles and decoration appropriate to be applied in contemporary Cornwall (one of the six Celtic nations), and use the Celtic language of Cornwall, being the original means of expression in this country for as long ago as the Roman empire at least..."