In 2010, I visited Istanbul for about a week and participated in a mosaic intensive with Sonia King. This mosaic was the project I started while there. I finished it at home shortly after returning.
The background moons, defined by an absence of material, were very tricky. Trying to maintain the flow through them was quite difficult, and required a lot of cutting of angles and odd shapes. The cuts had to be pretty precise to clearly define the moons.