... armbracelet knotting patterns.

Your question reminded me of the cover design (discussed here) of Dominus's book Higher Order Perl (freely downloadable here). I have not checked, but I think the code is discussed in HOP or somewhere on the site.

In reply to Re: an attempt to create graphics by using knotting patterns. by AnomalousMonk
in thread an attempt to create graphics by using knotting patterns. by Anonymous Monk

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