That is a great looking pen. Your precision looks to be spot on. Colors hies well together. What I really like about the design is how the more you look at it you see different designs within the design. There are triangles, squares, rectangles, pinwheels, probably more. This is a wonderful display of segmenting.
That is beautiful Alan. On my screen your joints look spot on, but 'I know' how segmenter's are very critical of our work, and that is OK. As mentioned by others, you have many excellent elements and you have really nailed this one. The placement of the pinwheels is very even on both ends. Seeing this is a pleasure!