A Field of Windmills

This pattern is a variation of "Not the Zipper". The main difference is that the pentagons have sides half the length of the triangles. They share only one vertex now. The negative space of a single loop reminds me of a windmill--hence the title.

A way to understand the generation of this image is to start with a triangular checker board of orange and purple then elaborate it using the following visual replacement rule.