Aidan Meehan is an Irish artist and author of 18 books on Celtic art and design. including the eight-volume Celtic Design series and Celtic Alphabets, Celtic Borders, The Book of Kells Painting Book, The Lindisfarne Painting Book and Celtic Knots, all published by Thames & Hudson == Career == In 1974 Meehan discovered the triple grid format for creating Knotwork. == Bibliography == Celtic Design: Knotwork: The Secret Method of the Scribes by Aidan Meehan published 1991 Celtic Design: A Begin…