Reticula. I happen to love optical illusions. I think that’s one of the reasons that I love exploring Zentangle reticulum. By using some careful shading, this tile may look like a series of “Ys” or it may look like “blossoms”. Prior to shading, it looks a bit like the tangle Fassett! It’s a lot of fun to play with. The fragment used here is B13 from the Zentangle Primer.