For the regular comic, ten levels of recursion was sufficient to complete the illusion, but I had to add two more for the larger version to still look good. I had to slightly modify the layout of the website to accommodate the joke, but I really think it looked better when I was thinking outside the box.
I also love that in Illustrator, when you zoom in, which I had to do in order to create the recursions properly, It's all still very clear and readable. I remember when I first discovered vector based art thinking that it was weird and too hard. Now, I don't know how I got by without it.