This tile is from Project Pack 2, The Twelve Days of Zentangle. On day three, Maria introduced a new tangle: Rumpus! This is an interesting tangle that starts off with a few dots and then builds like a symphony to a finale with sections being drawn behind one another. You, too, can be mesmerized watching her draw in the video here.
In addition, another technique, which she refers to as “enthatching” is introduced.