Balls is an Internet Meme Format and a art style that portrays balls with the skin of flags, planets, logos and typically white eyes, it has been used in alot of forms of art and genres like comics, animations, video games, etc.
Polandball (Countryballs)
Polandball or Countryballs is the most popular and well known formats of the Balls meme and the oldest one dating as far back as 2009. It is about Geography, History, Politics and as well as poking fun at countries in general. The comics are mostly posted on the official r/polandball subreddit where it has garned a community and claims as the main Polandball community, it has been around since 2011.
History
Drawball.com incident
Around August of 2009, Polish internet users, mainly from vykop.pl, insomnia.pl and kibice.net started to fill the canvas the polish flag with "POLSKA" written on it.