I won’t lie. This isn’t an easy tangle. It took me a lot of practice to get it right. It’s best done in a space at least twice as tall as it is wide. It isn’t an exact tessallation as I draw it, but it could be. I think for zens, it is best to just let it flow.
Ever since I went to an Escher exhibit, I’ve wanted to do a tangle like this. That man was a genius!
For variation, if you give the fish big or curved lips, and feather the fins and tails, you can make them look more like a parrot or chicken.