I am having so much fun playing with my stencils. Here, the 28 around checkerboard is overlaid with an Islamic style cosmic mandala of 12 around. Because they share a divisor for four, some interesting alignments happen.
Here's the checkerboard in silver, Islamic mandala in gold, and a star pattern, fives and sixes, on top in black. The stars and the mandala patterns meet up nicely in places due to their common divisor of six.
I am trying to work out a design for a thirty day month. I thought I could use sixes and fives, and bring in the twelve for the twelve months of the year, but I think the 28 grid may have to go. So I am working out other ideas and colors.
More in a few days, hopefully success!