Cack is an interesting tangle of intersecting circles from Adele Bruno. I need a little more practice.
I also need to remind myself not to put my initials on things until after I've done the shading. A lot can change with a little gray.
I used string idea #9 from tanglepatterns.
Tangles: Cack, Koryl, Paizel, Wud
I think this tile should be called "Primordial Soup" or "Life in an Aquarium". :)