Tetlow suggests that the creator of the design "embedded the secrets of its construction for us to decipher". He was referring to the blank lines that divide the pattern into thirds, and are the basis for explaining the construction of the "meander" pattern of rectangles. (Drawings of this bracelet and other information is available at http://www.monsangelorum.net/?p=18955)
I simply liked the pattern and wanted to make it continuous so I could use it on mugs or make my own ceramic bracelets. I imagined the person had simply not been able to keep track of the diagonal grid that the pattern is based on and I wanted to fill in the blanks.
To do this I used my Corel Draw program to manually trace the lines of the pattern and printed out many copies at different scales for me to work with, and ultimately to make adjustments and draw new lines that would fill in the blank to make the zigzag pattern blend into the spiral patterns and back again into the zigzags.
It took days of trial and error to come up with a solution that actually worked. Part of the effort was to colour in the pattern so I could keep track of which spirals were matching lines with other spirals. I also analyzed the diagonal grid that is embedded in the pattern, and the points where the Paleolithic artist seemed to loose track of this imaginary grid and presumably lost control of the procedure that would allow him/her to convert the spiral back to zigzag.
Here are the results: