Where the radii of 12- and 9-pointed stars can be drawn in line with each other, it’s not the case with 10- and 11-pointed stars. It takes some fitting work to place them in line as good as possible. The result is a pattern in which more forms are irregular.[br]This is disturbing in a detailed analysis of the pattern, but you hardly see it in when looking at a building with the pattern on it. Follow stepwise the construction of the pattern as described by Jay Bonner in his book Islamic Geometric Patterns (See references at the end).[br]

Combination possibilities of star patterns surrounded by not quite regular polygons are almost unlimited and mark a highlight in the development of Islamitic geometric pattern. Remarkably when looking at these patterns you hardly notice that they don’t show just 10- or 12-pointed stars. Only while examining closely you notice how clever more unusual stars are combined. A nice example of this is the Mu'Mine shrine in Nakhchyvan (Azerbeidzjan 1186-87). Only when looking and counting closely you see that it bears 13- and 11-pointed stars in an elegant looking pattern.