This sweater is the creation of Alice Starmore. The photo came from page 109 of the book "The Celtic Collection - 25 knitwear designs for men and women", by Trafalgar Square Publishing, 1993, 1997.

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Celtic links
Knots on the Web - by Peter Suber
Celtic Art Tattoo - Pat Fish
Peter Oostervink Celtic Art Home Page
Andrew Glassner Celtic Knots
Gael-Image Celtic wallpaper

An iron gate with Celtic motif

You can see this spiral pattern in soap films.

Spiral turbulence in fluid flow

Von Karman vortices from Wikipedia

Collection of Celtic spirals