If you aren't challenging yourself in some way, you aren't going to develop.
I always trying to push myself artistically, or in some other way to develop a new skill or refine a skill I've got.
I'm also a strong believer that if you're going to call someone out, you need to back up your words.
So, when I called out James Shields for his half-inch square map, I had to do something adequately interesting to compete with it. So, why not a new thumbnail map, but this time continuing across all my nails.