I love Escher! I had inexpensive Escher prints and a vintage poster when I was in college. I'm familiar with his tessellation designs, but not that one. I guess I remember the more generic birds and fishes designs.
That is awesome! And an awesome other hobby to have! One that I fully endorse and like myself, although I'm sure I know nothing about it and I don't own any Eschers other than what I had in college (which I wonder where they are now... somewhere in storage probably).
Absolutely delightful! Fantastic!