There is nothing intrinsically mathematical about this design. The curves are created by the natural distortion of the knitting, not by any special calculations.
It is unusual because it has seven sections. Many circular designs consist of six or eight sections, allowing for symmetrical repetition of colours. As 7 is a prime number it is not possible to have any rotation patterns here.
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One colour is worked at a time. The maximum number of stitches on the needle, at any time, is about one hundred.
The sections are joined as you go.
This could be made with seven balls of new yarn.
The afghan shown in the photo is made entirely from oddments of yarn from seven colour families.
It can be made to any size, using any type of yarn.
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