Jeanne at Just String blog has posted an excellent tutorial on spiral trellis stitch. The explanation is clear, and lots of photos guide us through the steps. Be aware that, because the post is picture heavy, it may take a while to load. But hang in there; it’s worth it!
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Have you read?
The Goldfish by Henri Matisse Advanced Cross Stitch Kit Review

The Goldfish by Henri Matisse Advanced Cross Stitch Kit transforms one of Matisse’s most colourful paintings into an impressive needlework project.
The original 1912 artwork is known for its vibrant colours and unusual composition, both of which translate beautifully into … Read More ...

Thanks for the compliment, Denise! I hope everyone enjoys the tutorial!
Oooh, neat!!
that is MAD! I want to go home right now and trellis stitch something! Thanks for sharing.