One of the designs from the Pelta Tessellation series felt a little GIFfy after a hard night drinking radiused arc shooters. They make Romulan ale pale in comparison. Burp!
So this is all about circles and arcs and tessellating them with 2 different pelta-based tessellations which is as obsessive as it sounds. In the close-up above, the arcs and circles created on gray areas are two variations on the classic pelta (2 circles whose diameter is the radius of a larger circle that they fit inside).