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I saw this on a leather book in a mail order catalog. This design is a bit confusing at first. Once I get started, it is amazingly clean and simple.

Animated graphics with this motif
Sweater with regular Celtic spiral
Celtic key by Robert Tusler
Celtic Art by Cari Buziak
Maze Patterns by Aidan Meehan
Celtic links
Peter Oostervink Celtic Art Home Page
Nan Halberg - knots and lattice
KNOTSBAG : Celtic knots from France