One of my Math Dept. members is retiring after teaching for 50 years. She has been teaching students who were becoming elementary school teachers. I was directed to come up with a retirement present. She has written books on Escher tilings and so, this is what I came up with. It is based on (copied from) Escher's Three Birds of 1948.
I used many advanced Designer features: trace, puff, conform, centerline, path offset, and keyhole.
It is not quite done. In a few days I will wet sand and polish the lacquer.